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), (-1, -1, 1), (0, 1, 0), (1, 1, 0)}.
A150044
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), (-1, -1, 1), (0, 1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =60a(5) =205a(6) =732a(7) =2667a(8) =9944a(9) =37635a(10) =144510a(11) =561066a(12) =2200371a(13) =8701862a(14) =34671959a(15) =139048957a(16) =560902064a(17) =2274347907a(18) =9265281738a(19) =37904895120a(20) =155669154825a(21) =641556300312
External references
- oeis: A150044