OFFSET
1,2
COMMENTS
The numerators are given in A101629.
a(13) and a(14) are indeed identical, namely 2737489312083963757320.
FORMULA
a(n)=denominator(s(n)) with s(n)=15*sum(1/((4*k-1)*k*(4*k+1)), k=1..n).
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Wolfdieter Lang, Dec 23 2004
STATUS
approved