Number of walks from (0,0) to (n,n) in the region 0 <= x-y <= 3 with the steps (1,0), (0, 1), (2,0) and (0,2).
A127617
Number of walks from (0,0) to (n,n) in the region 0 <= x-y <= 3 with the steps (1,0), (0, 1), (2,0) and (0,2).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =22a(4) =92a(5) =395a(6) =1684a(7) =7189a(8) =30685a(9) =130973a(10) =559038a(11) =2386160a(12) =10184931a(13) =43472696a(14) =185556025a(15) =792015257a(16) =3380586357a(17) =14429474710a(18) =61589830404a(19) =262886022219
External references
- oeis: A127617