Number of walks from (0,0) to (n,n) in the region x >= y with the steps (1,0), (0,1), (2,0) and (0,2).
A122951
Number of walks from (0,0) to (n,n) in the region x >= y with the steps (1,0), (0,1), (2,0) and (0,2).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =22a(4) =117a(5) =654a(6) =3843a(7) =23323a(8) =145172a(9) =921508a(10) =5942737a(11) =38825546a(12) =256431172a(13) =1709356836a(14) =11485249995a(15) =77703736926a(16) =528893901963
External references
- oeis: A122951