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, 1), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
A149033
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, 1), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =34a(5) =126a(6) =491a(7) =1949a(8) =7919a(9) =32903a(10) =138223a(11) =587746a(12) =2526421a(13) =10941149a(14) =47729602a(15) =209562569a(16) =924878572a(17) =4101835581a(18) =18270356562a(19) =81686164214a(20) =366493225290
External references
- oeis: A149033