1745731domain: NAppears in sequencesa(n) = ((2*n+1)!!)^4 * (Sum_{k=1..n} 1/(2*k+1)^4).at n=3A335092Square array T(n,k), n>=0, k>=0, read by antidiagonals: T(n,k) = ((2n+1)!!)^k * Sum_{j=1..n} 1/(2*j+1)^k.at n=31A335095