OFFSET
1,1
FORMULA
a(n) = numerator[Coefficient[Sum[Sum[(i+j)^(2n),{i,1,k}],{j,1,k}],k,2]]. a(n) = A100615(2n) - bisection of the numerators of B(n)(2).
MATHEMATICA
Numerator[Coefficient[Table[Sum[Sum[(i+j)^(2n), {i, 1, k}], {j, 1, k}], {n, 1, 20}], k, 2]]
CROSSREFS
KEYWORD
frac,sign
AUTHOR
Alexander Adamchuk, Jul 06 2006
STATUS
approved