292215domain: NAppears in sequencesa(n) = A001516(n)/2.at n=6A144659Number 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, -1), (-1, -1, 0), (-1, 0, 1), (1, -1, 0), (1, 1, 0)}.at n=11A149130