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, 0), (0, 0, 1), (1, 1, -1)}.
A148438
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, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =15a(5) =43a(6) =143a(7) =437a(8) =1417a(9) =4989a(10) =16662a(11) =57588a(12) =210213a(13) =738585a(14) =2655474a(15) =9938226a(16) =36093321a(17) =133318933a(18) =508179320a(19) =1889378414a(20) =7117855813a(21) =27515624661a(22) =104113056537a(23) =398189050433
External references
- oeis: A148438