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Search: id:A132658
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| A132658 |
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a(6n+k) = 3a(6n+k-1)-3a(6n+k-2)+2a(6n+k-3), k = 0, 1, 3, 4, 5; a(6n+2) = 3a(6n+1)-3a(6n). a(0) = a(1) = 0, a(2) = 1. |
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+0
2
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| 0, 0, 1, 3, 6, 11, 21, 42, 63, 105, 210, 441, 903, 1806, 2709, 4515, 9030, 18963, 38829, 77658, 116487, 194145, 388290, 815409, 1669647, 3339294, 5008941, 8348235, 16696470, 35062587, 71794821, 143589642, 215384463, 358974105, 717948210
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OFFSET
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0,4
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COMMENT
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The third differences are 0, 0, 1, 3, 6, -11, 21, 42, 63, 105, 210, -441, ..., equal to the original sequence if each 6th term is negated.
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CROSSREFS
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Cf. A024495.
Sequence in context: A007707 A018174 A050951 this_sequence A024495 A104253 A115030
Adjacent sequences: A132655 A132656 A132657 this_sequence A132659 A132660 A132661
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Nov 15 2007
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 07 2008
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