A069046 Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i^2)).

1, 4, 36, 144, 3600, 3600, 176400, 705600, 6350400, 31752000, 3841992000, 3841992000, 649296648000, 649296648000, 129859329600, 519437318400, 150117385017600, 150117385017600, 54192375991353600, 270961879956768000

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Crossrefs

Sequence in context: A120077 A007407 A051418 * A065886 A069053 A193282

Adjacent sequences: A069043 A069044 A069045 * A069047 A069048 A069049

Keyword

easy,nonn

Author

Benoit Cloitre, Apr 03 2002

Status

approved