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Search: id:A135069
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| A135069 |
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a(n) = [x^(2^n+n-1)] (x + x^2 + x^4 +...+ x^(2^n))^n / n for n>=1. |
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+0
4
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| 1, 1, 2, 4, 18, 106, 816, 4292, 59698, 594178, 9066286, 87498566, 1784642080, 20988667064
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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a(n) = A135068(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)/n)}
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CROSSREFS
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Cf. A135068, A135070, A135071.
Adjacent sequences: A135066 A135067 A135068 this_sequence A135070 A135071 A135072
Sequence in context: A095816 A020101 A099938 this_sequence A067647 A009667 A009508
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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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