92733domain: 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, 0), (-1, 0, 1), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.at n=9A149758Expansion of (1+x+x^2) / ((1-x)*(1-x-x^2)).at n=21A154691