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, -1), (0, 0, 1), (1, 0, 0)}.
A149811
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, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =26a(5) =71a(6) =213a(7) =642a(8) =1987a(9) =6308a(10) =20106a(11) =65821a(12) =217742a(13) =724972a(14) =2444807a(15) =8272648a(16) =28263198a(17) =97285043a(18) =336031660a(19) =1168259557a(20) =4074487345a(21) =14276504880a(22) =50258849286a(23) =177389376533a(24) =628444989771
External references
- oeis: A149811