1889917domain: NAppears in sequencesa(n) = T(n, 2*n-7), T given by A027960.at n=24A027969Number 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, 1, 1), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.at n=13A148333