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), (0, 1, -1), (1, 0, 0), (1, 0, 1), (1, 1, -1)}.
A150170
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), (0, 1, -1), (1, 0, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =76a(5) =299a(6) =1236a(7) =5232a(8) =22675a(9) =99949a(10) =447039a(11) =2022251a(12) =9240139a(13) =42562644a(14) =197455398a(15) =921601823a(16) =4324286790a(17) =20384608216a(18) =96487680824a(19) =458373282220
External references
- oeis: A150170