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, 1, -1), (1, 0, -1), (1, 1, 0)}.
A148949
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, 1, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =102a(6) =395a(7) =1494a(8) =5954a(9) =24246a(10) =99891a(11) =420520a(12) =1789506a(13) =7699288a(14) =33491490a(15) =146830382a(16) =648682014a(17) =2886460141a(18) =12915080021a(19) =58127021079a(20) =262856872073
External references
- oeis: A148949