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Search: id:A018186
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| A018186 |
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a_{n+2}=3a_n-a_{n-2}, for n\ge2. |
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+0
1
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| 1, 3, 6, 9, 19, 30, 63, 99, 208, 327, 687, 1080, 2269, 3567, 7494, 11781, 24751, 38910, 81747, 128511, 269992, 424443, 891723, 1401840, 2945161, 4629963, 9727206, 15291729, 32126779, 50505150, 106107543
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OFFSET
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0,2
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REFERENCES
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J.L. Simons, {\it Conditional recurring sequences}, Doctor's Thesis, Delft University of Technology, Delft, 1976 ({\bf MR} 54 \#7361) ].
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FORMULA
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G.f.: (1+3x+3x^2)/(1-3x^2-x^4).
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CROSSREFS
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Sequence in context: A057576 A100852 A059006 this_sequence A015938 A116614 A089001
Adjacent sequences: A018183 A018184 A018185 this_sequence A018187 A018188 A018189
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KEYWORD
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nonn
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AUTHOR
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H. J. J. te Riele (Herman.te.Riele(AT)cwi.nl)
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