366486domain: NAppears in sequencesNumber 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), (0, 1, -1), (1, -1, 1), (1, 0, 0), (1, 1, 1)}.at n=9A150883a(n) = [x^n] Product_{k=1..n} (1+x^k)^3 / x^(2*k).at n=9A258799