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, 1), (-1, 1, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148808
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, 1), (-1, 1, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =84a(6) =315a(7) =1155a(8) =4479a(9) =17879a(10) =72237a(11) =298920a(12) =1254329a(13) =5323120a(14) =22882116a(15) =99271167a(16) =434160320a(17) =1915240840a(18) =8499435683a(19) =37968001495a(20) =170538467281a(21) =769755420661
External references
- oeis: A148808