Number of intersection points outside the n-gon of all lines through pairs of vertices of a regular n-gon.

A146213

Number of intersection points outside the n-gon of all lines through pairs of vertices of a regular n-gon.

Terms

    a(0) =0a(1) =0a(2) =5a(3) =18a(4) =49a(5) =88a(6) =198a(7) =300a(8) =550a(9) =588a(10) =1235a(11) =1414a(12) =2415a(13) =2576a(14) =4284a(15) =3708a(16) =7068a(17) =7280a(18) =11025a(19) =11330a(20) =16445a(21) =14592a(22) =23650a(23) =23972a(24) =32994a(25) =33208a(26) =44863a(27) =34830a(28) =59675a(29) =59808

External references