128870domain: NAppears in sequencesa(n) = (n+1)^2*(n+2)*(5*n^2 + 15*n + 12)/24.at n=13A108676Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1)}.at n=10A149330