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Search: id:A112942
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| A112942 |
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INVERT transform (with offset) of sextuple factorials (A008543), where g.f. satisfies: A(x) = 1 + x*[d/dx x*A(x)^6]/A(x)^6. |
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+0
10
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| 1, 1, 6, 66, 1086, 24186, 684006, 23506626, 951191646, 44281107066, 2330310876486, 136747268000706, 8851092668419326, 626304664252772346, 48092138192079689766, 3982448437177141451586, 353746119265020213643806
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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G.f. satisfies: A(x) = 1+x + 6*x^2*[d/dx A(x)]/A(x) (log derivative). G.f.: A(x) = 1+x +6*x^2/(1-11*x -6*2*5*x^2/(1-23*x -6*3*11*x^2/(1-35*x -6*4*17*x^2/(1-47*x -... -6*n*(6*n-7)*x^2/(1-(12*n-1)*x -...)))) (continued fraction). G.f.: A(x) = 1/(1-1*x/(1 -5*x/(1-6*x/(1 -11*x/(1-12*x/(1 -17*x/(1-18*x/(1 -...)))))))) (continued fraction).
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EXAMPLE
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A(x) = 1 + x + 6*x^2 + 66*x^3 + 1086*x^4 + 24186*x^5 +...
1/A(x) = 1 - x - 5*x^2 - 55*x^3 - 935*x^4 -... -A008543(n)*x^(n+1)-...
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PROGRAM
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(PARI) {a(n)=local(F=1+x+x*O(x^n)); for(i=1, n, F=1+x+6*x^2*deriv(F)/F); return(polcoeff(F, n, x))}
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CROSSREFS
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Cf. A008543, A112943 (log derivative); A112934, A112935, A112936, A112937, A112938, A112939, A112940, A112941.
Sequence in context: A128319 A008548 A090358 this_sequence A113390 A122020 A126459
Adjacent sequences: A112939 A112940 A112941 this_sequence A112943 A112944 A112945
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Oct 09 2005
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