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, 0), (-1, 0, 0), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
A149658
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, 0), (-1, 0, 0), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =59a(5) =239a(6) =995a(7) =3967a(8) =16685a(9) =72029a(10) =308013a(11) =1326509a(12) =5839973a(13) =25751313a(14) =113486965a(15) =505253549a(16) =2264923651a(17) =10149497751a(18) =45647471491a(19) =206545814791a(20) =936339133515
External references
- oeis: A149658