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, 0, 0), (0, -1, 0), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.
A150851
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, 0, 0), (0, -1, 0), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =32a(4) =140a(5) =626a(6) =2886a(7) =13490a(8) =63872a(9) =305112a(10) =1467868a(11) =7102336a(12) =34517496a(13) =168387396a(14) =823951534a(15) =4042200638a(16) =19873743788a(17) =97891883374a(18) =482955922222
External references
- oeis: A150851