Number of convex polygons of length 2n on square lattice whose leftmost bottom vertex and rightmost top vertex have the same x-coordinate.
A005770
Number of convex polygons of length 2n on square lattice whose leftmost bottom vertex and rightmost top vertex have the same x-coordinate.
Terms
- a(0) =1a(1) =9a(2) =55a(3) =286a(4) =1362a(5) =6143a(6) =26729a(7) =113471a(8) =473471a(9) =1951612a(10) =7974660a(11) =32384127a(12) =130926391a(13) =527657073a(14) =2121795391a(15) =8518575466a(16) =34162154550a(17) =136893468863a(18) =548253828965
External references
- oeis: A005770