A076572 a(0)=1 if n>0 a(n)=(-1)^(n+1)/(2n+1)*sum(k=0,n,4^(4k)*B(2k)*C(2n+1,2k)) where B(k) denotes the k-th Bernoulli number.

1, 43, 2099, 388663, 139467719, 81165563683, 69426732871739, 81922705364469103, 127490352997174502159, 252973121503691631872923, 623357309124524241322006979, 1867492959566204749744784303143

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Crossrefs

Sequence in context: A009987 A267532 A335207 * A015258 A130014 A246535

Adjacent sequences: A076569 A076570 A076571 * A076573 A076574 A076575

Keyword

nonn

Author

Benoit Cloitre, Oct 19 2002

Status

approved