161472domain: 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, -1, 1), (-1, 1, 1), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.at n=9A150436a(n) = 2^(n-2) * (n! + floor(n/2)!).at n=7A271213