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, 0, 1), (1, 1, -1), (1, 1, 1)}.
A149651
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, 0, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =73a(5) =249a(6) =1225a(7) =4587a(8) =22713a(9) =89435a(10) =444383a(11) =1807377a(12) =8999213a(13) =37450959a(14) =186719083a(15) =790438487a(16) =3944246321a(17) =16919418543a(18) =84475250599a(19) =366211164923
External references
- oeis: A149651