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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, 1), (1, 0, -1)}.
A150473
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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =25a(4) =99a(5) =404a(6) =1710a(7) =7397a(8) =32598a(9) =145601a(10) =657960a(11) =3000643a(12) =13791325a(13) =63806466a(14) =296873158a(15) =1388007345a(16) =6517379983a(17) =30717477390a(18) =145259967469a(19) =688974178087
External references
- oeis: A150473