88154domain: 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, 0), (0, 0, -1), (0, 0, 1), (1, 0, 1)}.at n=9A150336a(n) = Sum_{k=3..n} binomial(k,3) * floor(n/k).at n=37A366971