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, 0, 1), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
A150135
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, 0, 1), (0, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =72a(5) =277a(6) =1109a(7) =4578a(8) =19276a(9) =82614a(10) =359661a(11) =1586055a(12) =7067002a(13) =31747505a(14) =143674019a(15) =654614385a(16) =3000538614a(17) =13824229597a(18) =63972253270a(19) =297222305536
External references
- oeis: A150135