68578domain: NAppears in sequencesa(n) = A026626(2*n, n).at n=9A026627a(n) = A026626(n, floor(n/2)).at n=18A026632Number 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, 0, 1), (1, 0, 0), (1, 1, -1), (1, 1, 1)}.at n=8A150827