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, -1), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
A148227
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, -1), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =32a(6) =107a(7) =303a(8) =1129a(9) =3434a(10) =13071a(11) =42148a(12) =167993a(13) =561875a(14) =2267904a(15) =7834604a(16) =32442310a(17) =114598028a(18) =478406714a(19) =1725209229a(20) =7320631607a(21) =26799600927a(22) =114360856625a(23) =424737947485
External references
- oeis: A148227