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), (0, 0, 1), (0, 1, -1), (1, -1, 1)}.
A148153
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), (0, 0, 1), (0, 1, -1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =30a(6) =94a(7) =299a(8) =991a(9) =3390a(10) =11925a(11) =42865a(12) =156975a(13) =583406a(14) =2199907a(15) =8397070a(16) =32397041a(17) =126177221a(18) =495665601a(19) =1962310738a(20) =7823383494a(21) =31389093385a(22) =126675590877a(23) =513964543645
External references
- oeis: A148153