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, -1, 1), (-1, 1, 0), (1, -1, 1), (1, 1, 0)}.
A149166
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, -1, 1), (-1, 1, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =42a(5) =120a(6) =570a(7) =1825a(8) =8890a(9) =30534a(10) =149418a(11) =536896a(12) =2650062a(13) =9848282a(14) =48696782a(15) =185458037a(16) =920584716a(17) =3576385528a(18) =17767869592a(19) =70107220264a(20) =348996559758
External references
- oeis: A149166