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A069046 Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i^2)). 0
1, 4, 36, 144, 3600, 3600, 176400, 705600, 6350400, 31752000, 3841992000, 3841992000, 649296648000, 649296648000, 129859329600, 519437318400, 150117385017600, 150117385017600, 54192375991353600, 270961879956768000 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 25 09:02 EDT 2021. Contains 346286 sequences. (Running on oeis4.)