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), (0, 1, 1), (1, 1, -1)}.
A149003
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), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =34a(5) =120a(6) =478a(7) =1872a(8) =7709a(9) =31816a(10) =134780a(11) =573835a(12) =2480705a(13) =10788275a(14) =47350778a(15) =209012171a(16) =928390519a(17) =4143344634a(18) =18578397587a(19) =83628064271a(20) =377823717954
External references
- oeis: A149003