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, 1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
A149050
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, 1), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =39a(5) =149a(6) =621a(7) =2608a(8) =11362a(9) =50005a(10) =224087a(11) =1013844a(12) =4634939a(13) =21348758a(14) =99021584a(15) =461872495a(16) =2165291885a(17) =10194743118a(18) =48184538956a(19) =228506836782
External references
- oeis: A149050