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, 0), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
A149883
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, 0), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =44a(5) =147a(6) =508a(7) =1806a(8) =6593a(9) =24580a(10) =93111a(11) =357499a(12) =1389352a(13) =5456743a(14) =21626045a(15) =86391867a(16) =347600899a(17) =1407638294a(18) =5733467909a(19) =23475925302a(20) =96585554635a(21) =399129402469
External references
- oeis: A149883