A238164 2^floor(log[2](n+1))*(2*n+1)!*Bernoulli(2*n,1/2).

1, -1, 7, -465, 48006, -12072375, 6301495035, -12203470904625, 20180112406353900, -53495387545025175750, 216267236072968468547250, -1280630367874799320798794375, 10743714652441927865738713818750, -124178158916511109662405449217796875, 1930915681227482441797773554892002071875

Offset

0,3

Comments

Motivated by the original definition of A033473 which turned out to produce a non-integer sequence.

Links

M. F. Hasler, Table of n, a(n) for n = 0..50

Index entries for sequences related to Bernoulli numbers.

Prog

(PARI) n->(2*n+1)!*subst(bernpol(2*n, x), x, 1/2)<<(log(n+1)\log(2))

Crossrefs

Sequence in context: A127908 A015105 A269550 * A112949 A254966 A345455

Adjacent sequences: A238161 A238162 A238163 * A238165 A238166 A238167

Keyword

sign

Author

M. F. Hasler, Feb 18 2014

Status

approved