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), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
A149327
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), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =38a(5) =147a(6) =542a(7) =2025a(8) =8040a(9) =31830a(10) =126026a(11) =512397a(12) =2091005a(13) =8534552a(14) =35263659a(15) =146386680a(16) =608204284a(17) =2542561872a(18) =10671803324a(19) =44849685497a(20) =189137805612a(21) =800087487080
External references
- oeis: A149327