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, 0, 0), (-1, 0, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A149008
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, 0, 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) =125a(6) =488a(7) =1975a(8) =8084a(9) =33883a(10) =143959a(11) =617600a(12) =2681872a(13) =11727038a(14) =51658256a(15) =229044711a(16) =1020550074a(17) =4570049184a(18) =20550100281a(19) =92745397635a(20) =420029964181
External references
- oeis: A149008