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Search: id:A080951
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| A080951 |
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Sequence associated with recurrence a(n)=2*a(n-1)+k(k+2)*a(n-2). |
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+0
9
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| 1, 5, 30, 140, 560, 2016, 6720, 21120, 63360, 183040, 512512, 1397760, 3727360, 9748480, 25067520, 63504384, 158760960, 392232960, 958791680, 2321285120, 5571084288, 13264486400, 31352422400, 73610035200, 171756748800
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Fifth column of triangle A080928.
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FORMULA
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G.f.: (1-x)(1-4x+16x^2-24x^3+16x^4)/(1-2x)^5
ceil(binomial(n+4,4)*2^(n-1)). - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 01 2006
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MAPLE
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[seq( ceil(binomial(n+4, 4)*2^(n-1)), n=0..24)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 01 2006
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CROSSREFS
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Cf. A082140, A082141, A082138, A082139, A080929, A057711.
Sequence in context: A000649 A027173 A054612 this_sequence A055298 A104891 A110155
Adjacent sequences: A080948 A080949 A080950 this_sequence A080952 A080953 A080954
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Feb 26 2003
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