98456domain: NAppears in sequencesa(n) = n^4/8 + (5*n^3)/12 - n^2/8 - (5*n)/12 + 1.at n=30A226639Irregular triangular array T; row n shows the coefficients of the (n-1)-st polynomial in the obverse convolution s(x)**t(x), where s(x) = n^2 x and t(x) = x+2. See Comments.at n=23A375043