259969domain: 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, 0, 1), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.at n=9A150658a(n) = (2^(n+4)-1)*(2^n-1).at n=7A165130