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, 0), (-1, 0, 0), (0, 0, -1), (1, -1, 1), (1, 1, 0)}.
A149193
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, 0), (-1, 0, 0), (0, 0, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =127a(6) =493a(7) =1841a(8) =7280a(9) =28878a(10) =116567a(11) =478811a(12) =1973493a(13) =8272377a(14) =34738919a(15) =147542225a(16) =629264252a(17) =2700080188a(18) =11655144044a(19) =50463437540a(20) =219806610774a(21) =959526286345
External references
- oeis: A149193