58052domain: NAppears in sequencesa(n) = A026637(2*n, n-1).at n=8A026639Number 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, 1), (-1, 1, -1), (0, 0, 1), (0, 1, 1), (1, 0, -1)}.at n=9A150040