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, 1), (-1, 1, -1), (0, -1, 1), (1, 1, 0)}.
A149186
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, 1), (-1, 1, -1), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =36a(5) =125a(6) =454a(7) =1722a(8) =6609a(9) =25843a(10) =102590a(11) =411104a(12) =1663187a(13) =6782912a(14) =27831566a(15) =114882503a(16) =476493101a(17) =1985031001a(18) =8300902795a(19) =34833257984a(20) =146612269660a(21) =618823561050
External references
- oeis: A149186