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A119969 Sum{k>=0, C(2^k-1,n-2*(2^k-1))}. 1
1, 0, 1, 1, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 1, 7, 21, 35, 35, 21, 7, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 15, 105, 455, 1365, 3003, 5005, 6435, 6435, 5005, 3003, 1365, 455, 105, 15, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 31, 465, 4495, 31465, 169911, 736281, 2629575 (list; graph; refs; listen; history; internal format)
OFFSET

0,8

FORMULA

G.f.: sum{k>=0, (x^2*(1+x))^(2k-1)}; a(n)=sum{k=0..floor(n/2), C(k,n-2k)*mod(C(k),2)}; a(n)=sum{k=0..floor(n/2), C(k,n-2k)*A036987(k)}.

CROSSREFS

Sequence in context: A031438 A096964 A123254 * A051343 A205826 A131193

Adjacent sequences:  A119966 A119967 A119968 * A119970 A119971 A119972

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jun 01 2006

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Last modified February 16 11:51 EST 2012. Contains 205908 sequences.