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, -1, 0), (1, 0, -1), (1, 1, 1)}.
A149588
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, -1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =55a(5) =215a(6) =903a(7) =3543a(8) =15115a(9) =64327a(10) =277887a(11) =1187513a(12) =5267153a(13) =23088101a(14) =102403601a(15) =454033517a(16) =2045486909a(17) =9139919249a(18) =41272851285a(19) =186370747591a(20) =847763870523
External references
- oeis: A149588