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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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4
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1, 1, 2, 4, 18, 106, 816, 4292, 59698, 594178, 9066286, 87498566, 1784642080, 20988667064, 380829128200, 4301687654136, 167344151387170, 2948286694377154, 81332961594822202, 1301097749397343978, 48612398553534689114, 904790963165201870170
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| a(n) = A135068(n)/n for n>=1.
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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)/n)}
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CROSSREFS
| Cf. A135068, A135070, A135071.
Sequence in context: A095816 A020101 A099938 * A067647 A009667 A009508
Adjacent sequences: A135066 A135067 A135068 * A135070 A135071 A135072
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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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