A090645 a(n)=(-1)^(n+1)*2*(16^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.

0, 5, 17, 195, 4369, 158875, 8493081, 626349395, 60921163553, 7555181167755, 1163556514166185, 217865966280741955, 48740349457479955377, 12839917161220487631995, 3934089704476487908489529

Offset

0,2

Links

Table of n, a(n) for n=0..14.

Mathematica

Table[(-1)^(n+1) 2(16^n-1)BernoulliB[2n], {n, 0, 20}] (* Harvey P. Dale, Nov 10 2011 *)

Prog

(PARI) a(n)=(-1)^(n+1)*2*(16^n-1)*bernfrac(2*n)

Crossrefs

Sequence in context: A309178 A164740 A053678 * A206328 A096407 A216428

Adjacent sequences: A090642 A090643 A090644 * A090646 A090647 A090648

Keyword

nonn

Author

Benoit Cloitre, Dec 13 2003

Status

approved