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), (1, 0, 1), (1, 1, -1)}.
A149349
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), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =42a(5) =153a(6) =595a(7) =2343a(8) =9542a(9) =39413a(10) =166281a(11) =708897a(12) =3061940a(13) =13353865a(14) =58750955a(15) =260487890a(16) =1162823080a(17) =5222031742a(18) =23582500740a(19) =107010241453a(20) =487788886128
External references
- oeis: A149349