840429domain: NAppears in sequencesa(n) = (3/8)*(n-1)*(n-2)*(27*n^2-137*n+180).at n=18A134176Number 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, -1, 1), (0, 0, -1), (0, 1, 0), (1, 1, 0)}.at n=11A150084