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, 1, 0), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148565
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, 1, 0), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =18a(5) =51a(6) =168a(7) =549a(8) =1909a(9) =6683a(10) =24229a(11) =89289a(12) =335672a(13) =1277955a(14) =4928340a(15) =19227809a(16) =75796636a(17) =301563679a(18) =1209229277a(19) =4885143469a(20) =19868156821a(21) =81315289674a(22) =334668089608
External references
- oeis: A148565