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A135921
O.g.f.: A(x) = Sum_{n>=0} x^n / Product_{k=0..n} (1 - k*(k+1)*x).
+0
2
1, 1, 3, 13, 81, 669, 6955, 88505, 1346209, 23998521, 493956467, 11596542533, 307301505073, 9110471500693, 299893197116059, 10888674034993905, 433549376981078593, 18833037527449398129, 888439543634687700579
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Maintained by
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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.
AT&T Labs Research
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