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), (0, 0, 1), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.
A151180
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), (0, 0, 1), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =50a(4) =227a(5) =1047a(6) =4939a(7) =23571a(8) =113575a(9) =550785a(10) =2685286a(11) =13143538a(12) =64538881a(13) =317716079a(14) =1567357416a(15) =7745417246a(16) =38330815841a(17) =189923526167a(18) =942013070950
External references
- oeis: A151180