176307domain: 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), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.at n=10A149985a(n) = Sum_{k=0..n} (2^k + 1) * (2^k + 2) / 2.at n=9A346295