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, 0, 0), (1, 0, -1), (1, 1, 0)}.
A148567
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, 0, 0), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =19a(5) =48a(6) =163a(7) =458a(8) =1605a(9) =4837a(10) =17348a(11) =54662a(12) =199115a(13) =648801a(14) =2391554a(15) =7986126a(16) =29705879a(17) =101170951a(18) =379067774a(19) =1311200087a(20) =4941974339a(21) =17317592643a(22) =65592787213a(23) =232321727590a(24) =883623114005
External references
- oeis: A148567