Number of 4n-step lattice paths starting and ending at (0,0) that do not go above the diagonal x=y or below the x-axis using steps in {(1,1), (1,-1), (-1,0)}.
A361190
Number of 4n-step lattice paths starting and ending at (0,0) that do not go above the diagonal x=y or below the x-axis using steps in {(1,1), (1,-1), (-1,0)}.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =153a(4) =3579a(5) =101630a(6) =3288871a(7) =116951012a(8) =4465824585a(9) =180310624841
External references
- oeis: A361190