1000440domain: NAppears in sequencesTriangle T, read by rows, where g.f. of row n of T^n = (y + n*(n+1))^n for n>=0 and T^n denotes the n-th matrix power of T.at n=23A132875Number of length n+7 0..2 arrays with at most one downstep in every n consecutive neighbor pairs.at n=26A255114