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A090645 a(n)=(-1)^(n+1)*2*(16^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number. 0
0, 5, 17, 195, 4369, 158875, 8493081, 626349395, 60921163553, 7555181167755, 1163556514166185, 217865966280741955, 48740349457479955377, 12839917161220487631995, 3934089704476487908489529 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)