328888domain: 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, 0), (-1, 0, 1), (-1, 1, 0), (0, 1, -1), (1, 0, 0)}.at n=12A148588a(n) = (n^4 + 2*n^3 - n^2)/2.at n=28A255499