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, 1, 1), (0, 1, -1), (1, 0, 0)}.
A148163
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, 1, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =31a(6) =91a(7) =283a(8) =901a(9) =2904a(10) =9521a(11) =31808a(12) =107236a(13) =364364a(14) =1251636a(15) =4333312a(16) =15077986a(17) =52788201a(18) =185909398a(19) =657386742a(20) =2333476922a(21) =8317496562a(22) =29746811372a(23) =106682779598a(24) =383721471229
External references
- oeis: A148163