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, 0), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148458
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, 0), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =57a(6) =197a(7) =707a(8) =2636a(9) =10048a(10) =39101a(11) =155433a(12) =626277a(13) =2558928a(14) =10573720a(15) =44116907a(16) =185795210a(17) =788396954a(18) =3369705436a(19) =14493667156a(20) =62695350738a(21) =272644070203
External references
- oeis: A148458