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, 0, 1), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149221
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, 0, 1), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =44a(5) =142a(6) =639a(7) =2306a(8) =10609a(9) =40699a(10) =190471a(11) =758754a(12) =3593080a(13) =14686804a(14) =70177775a(15) =292328166a(16) =1406400261a(17) =5943972895a(18) =28744484098a(19) =122895902695a(20) =596740619839
External references
- oeis: A149221