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), (0, 0, -1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149159
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), (0, 0, -1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =40a(5) =113a(6) =524a(7) =1692a(8) =8000a(9) =27819a(10) =133388a(11) =488738a(12) =2363983a(13) =8988630a(14) =43753966a(15) =171135009a(16) =836912246a(17) =3346439852a(18) =16423513868a(19) =66848509014a(20) =328987390212
External references
- oeis: A149159