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, 0, 0), (-1, 1, -1), (-1, 1, 1), (1, 0, 0)}.
A148531
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, 0, 0), (-1, 1, -1), (-1, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =19a(5) =39a(6) =165a(7) =377a(8) =1675a(9) =4079a(10) =18529a(11) =47035a(12) =217047a(13) =567995a(14) =2653997a(15) =7110249a(16) =33549099a(17) =91566215a(18) =435189965a(19) =1205660275a(20) =5762040619a(21) =16160773167a(22) =77582569441a(23) =219855469855
External references
- oeis: A148531