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, 0, -1), (0, 1, 0), (1, 0, 0)}.
A149965
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, 0, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =54a(5) =193a(6) =726a(7) =2808a(8) =11132a(9) =45078a(10) =185477a(11) =773541a(12) =3264268a(13) =13912595a(14) =59806475a(15) =259038190a(16) =1129476172a(17) =4953975376a(18) =21843387803a(19) =96772415696a(20) =430576585593
External references
- oeis: A149965