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, -1, 1), (1, 1, -1), (1, 1, 0)}.
A149286
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, -1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =44a(5) =163a(6) =660a(7) =2744a(8) =11609a(9) =50491a(10) =222050a(11) =990487a(12) =4470299a(13) =20329678a(14) =93309453a(15) =430847108a(16) =2001760287a(17) =9349413398a(18) =43860569586a(19) =206640193818a(20) =977015030033
External references
- oeis: A149286