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, 0), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149206
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, 0), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =40a(5) =129a(6) =540a(7) =1897a(8) =8246a(9) =30665a(10) =135859a(11) =524585a(12) =2358632a(13) =9347568a(14) =42477772a(15) =171734447a(16) =786713158a(17) =3229974119a(18) =14891910671a(19) =61902473315a(20) =286878483816
External references
- oeis: A149206