679798domain: NAppears in sequencesa(n+1) = (n+1)*a(n) + Sum_{k=1..n-1} a(k)*a(n-k).at n=8A006014Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (-1, 1, 1), (1, -1, 1), (1, 0, -1), (1, 0, 0)}.at n=11A148911