OFFSET
0,2
COMMENTS
Pi^(2*n) > A295231(n)/a(n) for n > 0.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..275
EXAMPLE
Zeta(2) = Pi^2/6 > 1 + 1/2^2, so Pi^2 > 15/2.
Zeta(4) = Pi^4/90 > 1 + 1/2^4, so Pi^4 > 765/8.
Zeta(6) = Pi^6/945 > 1 + 1/2^6, so Pi^6 > 61425/64.
PROG
(PARI) {a(n) = denominator((-1)^(n+1)*(2*n)!*(2^(2*n)+1)/(bernfrac(2*n)*2^(4*n-1)))}
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Seiichi Manyama, Nov 18 2017
STATUS
approved