A228427 Denominator of Sum(i=1..n-1, 1/i^(2*n-1)).

1, 1, 32, 279936, 5159780352, 36279705600000000000, 43535646720000000000000, 248025792814017858404352000000000000000, 17203888069958467671501449252044800000000000000000

Offset

1,3

Comments

Numerators are in A228426.

Links

Table of n, a(n) for n=1..9.

Prog

(PARI) a(n)=denominator(sum(i=1, n-1, 1/i^(2*n-1)))

Crossrefs

Cf. A001008/A002805.

Sequence in context: A159414 A094814 A017297 * A186010 A017417 A286179

Adjacent sequences: A228424 A228425 A228426 * A228428 A228429 A228430

Keyword

nonn,frac

Author

Ralf Stephan, Nov 10 2013

Status

approved