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Search: id:A135068
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| A135068 |
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a(n) = [x^(2^n+n-1)] (x + x^2 + x^4 +...+ x^2^n)^n for n>=1. |
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+0
4
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| 1, 2, 6, 16, 90, 636, 5712, 34336, 537282, 5941780, 99729146, 1049982792, 23200347040, 293841338896, 5712436923000, 68827002466176, 2844850573581890, 53069160498788772, 1545326270301621838
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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n divides a(n): A135069(n) = a(n)/n for n>=1.
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PROGRAM
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(PARI) a(n)=if(n<1, 0, polcoeff(sum(j=0, n, x^(2^j)+O(x^(2^n+n)))^n, 2^n+n-1))
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CROSSREFS
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Cf. A007178 (variant); A135069, A135070 (variant), A135071.
Sequence in context: A147889 A137858 A074740 this_sequence A147950 A147941 A147932
Adjacent sequences: A135065 A135066 A135067 this_sequence A135069 A135070 A135071
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KEYWORD
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more,nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Nov 17 2007
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EXTENSIONS
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a(15) - a(19) from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Apr 29 2009
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