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A119968
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Binomial transform of Fredholm-Rueppel sequence.
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2
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1, 2, 3, 5, 9, 16, 27, 44, 73, 130, 251, 507, 1025, 2016, 3811, 6907, 12033, 20282, 33475, 55253, 94185, 171896, 342651, 737266, 1655657, 3751786, 8386587, 18274843, 38629505, 79123224, 157157411, 303174298, 569093601, 1041436386
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Binomial transform of A036987.
Number of compositions of n such that number of parts is of the form 2^m, m>=0 (offset 1). - Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 27 2007
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FORMULA
| G.f.: (1/(1-x))*sum{k>=0, (x/(1-x))^(2^k-1)}; a(n)=sum{k=0..n, C(n,2^k-1)}; a(n)=sum{k=0..n, C(n,k)*mod(C(k),2)};
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CROSSREFS
| Sequence in context: A066726 A124642 A011826 * A017914 A137402 A134009
Adjacent sequences: A119965 A119966 A119967 * A119969 A119970 A119971
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Jun 01 2006
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