Place n points in general position on each side of a square, and join every pair of the 4*n+4 boundary points by a chord; sequence gives number of regions in the resulting planar graph.

A367121

Place n points in general position on each side of a square, and join every pair of the 4*n+4 boundary points by a chord; sequence gives number of regions in the resulting planar graph.

Terms

    a(0) =4a(1) =67a(2) =406a(3) =1441a(4) =3796a(5) =8299a(6) =15982a(7) =28081a(8) =46036a(9) =71491a(10) =106294a(11) =152497a(12) =212356a(13) =288331a(14) =383086a(15) =499489a(16) =640612a(17) =809731a(18) =1010326a(19) =1246081a(20) =1520884a(21) =1838827a(22) =2204206a(23) =2621521a(24) =3095476a(25) =3630979a(26) =4233142a(27) =4907281a(28) =5658916a(29) =6493771

External references