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, 1), (-1, 1, 1), (0, 0, 1), (1, 1, -1)}.
A148457
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, 1), (-1, 1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =55a(6) =191a(7) =641a(8) =2338a(9) =8412a(10) =31626a(11) =118683a(12) =457359a(13) =1763742a(14) =6931137a(15) =27261381a(16) =108770025a(17) =434387917a(18) =1753998833a(19) =7090521404a(20) =28908852160a(21) =118022306253a(22) =485066186991
External references
- oeis: A148457