102766domain: 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, -1, 1), (0, 1, -1), (0, 1, 0), (1, 0, 0)}.at n=9A150171Expansion of (1/(3*x)) * Series_Reversion( x / ((1+x)^2 * (x+3*(1+x)^2)) ).at n=4A388916