744984domain: 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, -1, 1), (-1, 0, 1), (0, 1, 1), (1, -1, -1), (1, 1, 0)}.at n=10A150508a(n) = Sum_{k=1..n} binomial(2*k, n-k)^2 * n/k.at n=9A198059