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, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A149004
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, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =34a(5) =120a(6) =478a(7) =1876a(8) =7726a(9) =31988a(10) =135587a(11) =578373a(12) =2501885a(13) =10893224a(14) =47843288a(15) =211370492a(16) =939417488a(17) =4195231602a(18) =18820443103a(19) =84759560538a(20) =383100599492
External references
- oeis: A149004