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, 1, -1), (-1, 1, 0), (0, 1, 1), (1, 0, 0)}.
A149990
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, 1, -1), (-1, 1, 0), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =57a(5) =207a(6) =765a(7) =2909a(8) =11291a(9) =44081a(10) =175584a(11) =703093a(12) =2841402a(13) =11564076a(14) =47337597a(15) =194895967a(16) =805502604a(17) =3345308673a(18) =13940425210a(19) =58284862481a(20) =244441854605
External references
- oeis: A149990