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, 1, -1), (1, 1, 0)}.
A149211
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, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =40a(5) =138a(6) =565a(7) =2176a(8) =9188a(9) =37402a(10) =161792a(11) =683613a(12) =3011220a(13) =13056815a(14) =58330575a(15) =257707423a(16) =1164365165a(17) =5218512437a(18) =23796555039a(19) =107869829968a(20) =495677234473
External references
- oeis: A149211