A090644 a(n)=(-1)^(n+1)*(5/4)*(25^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.

0, 5, 26, 465, 16276, 924775, 77244126, 8900960285, 1352721569576, 262123002742995, 63076525023488626, 18453965152519328905, 6450731539245926745276, 2655232635637124377694015, 1271172942026336302668331526

Offset

0,2

Links

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

Mathematica

Table[Abs[5/4*(25^n-1)*BernoulliB[2n]], {n, 0, 20}] (* Harvey P. Dale, Jan 22 2015 *)

Prog

(PARI) a(n)=(-1)^(n+1)*(5/4)*(25^n-1)*bernfrac(2*n)

Crossrefs

Sequence in context: A077537 A140423 A324419 * A196951 A156217 A156216

Adjacent sequences: A090641 A090642 A090643 * A090645 A090646 A090647

Keyword

nonn

Author

Benoit Cloitre, Dec 13 2003

Status

approved