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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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4
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1, 2, 6, 16, 90, 636, 5712, 34336, 537282, 5941780, 99729146, 1049982792, 23200347040, 293841338896, 5712436923000, 68827002466176, 2844850573581890, 53069160498788772, 1545326270301621838, 26021954987946879560, 1020860369624228471394, 19905401189634441143740
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n) = A135069(n)*n.
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PROG
| (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
| Cf. A007178 (variant); A135069, A135070 (variant), A135071.
Sequence in context: A137858 A074740 A204436 * A147950 A147941 A147932
Adjacent sequences: A135065 A135066 A135067 * A135069 A135070 A135071
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Nov 17 2007
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EXTENSIONS
| a(15) - a(19) from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Apr 29 2009
a(20) - a(22) from Max Alekseyev (maxale(AT)gmail.com), Dec 03 2010
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