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, 0, 0), (-1, 0, 1), (1, -1, 0), (1, 0, -1), (1, 1, 0)}.
A149376
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, 0, 0), (-1, 0, 1), (1, -1, 0), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =48a(5) =165a(6) =711a(7) =2765a(8) =12230a(9) =50199a(10) =227229a(11) =970714a(12) =4459345a(13) =19565405a(14) =90903964a(15) =406827818a(16) =1906585122a(17) =8662077597a(18) =40874264328a(19) =187908308360a(20) =891647946915
External references
- oeis: A149376