719583

Appears in sequences

• Number 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, 0, 0)}.at n=15A148071
• a(n) = Sum_{k=0..floor(n/3)} binomial(n+k-1,k) * binomial(n-k-1,n-3*k).at n=15A389375