Number of edges in a regular 2n-gon when all vertices are connect by straight lines except for the n lines joining diametrically opposite vertices.

A368815

Number of edges in a regular 2n-gon when all vertices are connect by straight lines except for the n lines joining diametrically opposite vertices.

Terms

    a(0) =0a(1) =4a(2) =24a(3) =104a(4) =320a(5) =648a(6) =1540a(7) =2832a(8) =3996a(9) =7860a(10) =12100a(11) =15552a(12) =25376a(13) =35084a(14) =36840a(15) =62752a(16) =81600a(17) =97272a(18) =131556a(19) =163720a(20) =178332a(21) =245564a(22) =296516a(23) =336960a(24) =421600a(25) =497172a(26) =557280a(27) =678552a(28) =786016a(29) =836520

External references