722480468750domain: NAppears in sequencesa(n) = 5^(2*n)*(5^(2*n)-1)*Bernoulli(2*n)/(2*n).at n=4A047683Array t(n,k) = k^(2n)*(k^(2n)-1)*BernoulliB(2n)/(2n), n>=1, k>=2, absolute values read by ascending antidiagonals.at n=31A241066