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, 0), (1, 0, -1), (1, 1, 1)}.
A149247
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, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =116a(6) =440a(7) =1453a(8) =5530a(9) =18794a(10) =72792a(11) =257238a(12) =992644a(13) =3549594a(14) =13853496a(15) =50447453a(16) =196718714a(17) =721500978a(18) =2829371848a(19) =10503154516a(20) =41147601932a(21) =153417689174a(22) =603530012488
External references
- oeis: A149247