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

A368814

Number of vertices 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) =2a(1) =4a(2) =12a(3) =48a(4) =150a(5) =288a(6) =728a(7) =1344a(8) =1782a(9) =3780a(10) =5852a(11) =7224a(12) =12350a(13) =17108a(14) =16620a(15) =30720a(16) =40018a(17) =46728a(18) =64676a(19) =80560a(20) =84462a(21) =121044a(22) =146280a(23) =163728a(24) =208250a(25) =245700a(26) =271836a(27) =335664a(28) =389006a(29) =404400

External references