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, 0), (-1, 1, -1), (0, 1, 1), (1, 0, -1), (1, 0, 0)}.
A150017
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, 0), (-1, 1, -1), (0, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =66a(5) =244a(6) =969a(7) =3910a(8) =15996a(9) =66897a(10) =282755a(11) =1207481a(12) =5203126a(13) =22601356a(14) =98848043a(15) =434437333a(16) =1920624701a(17) =8530573178a(18) =38019148241a(19) =170151483827a(20) =764088116366
External references
- oeis: A150017