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, 1, 0), (1, -1, 1), (1, 1, 0)}.
A149220
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, 1, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =44a(5) =139a(6) =639a(7) =2263a(8) =10648a(9) =40299a(10) =192315a(11) =759953a(12) =3660976a(13) =14910101a(14) =72309706a(15) =301114206a(16) =1467593460a(17) =6216146303a(18) =30412604507a(19) =130551922856a(20) =640652463508
External references
- oeis: A149220