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), (-1, 0, 1), (0, 0, -1), (1, 1, 0)}.
A149128
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), (-1, 0, 1), (0, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =34a(5) =104a(6) =382a(7) =1339a(8) =4988a(9) =18544a(10) =70850a(11) =271890a(12) =1060528a(13) =4161164a(14) =16487268a(15) =65749179a(16) =263892516a(17) =1065095388a(18) =4320942050a(19) =17607151198a(20) =72053673624a(21) =295956572780
External references
- oeis: A149128