1574289domain: NAppears in sequencesSquare array T(n,k), n>=0, k>=0, read by antidiagonals downwards, where column k is the expansion of 1/(1 - 9*x*(1 + x)^k)^(1/3).at n=52A361839Expansion of 1/(1 - 9*x*(1+x)^2)^(1/3).at n=7A361841