Number of 5-cycles in the n-polygon diagonal intersection graph.

Terms

a(0) =0a(1) =4a(2) =12a(3) =36a(4) =56a(5) =120a(6) =135a(7) =250a(8) =297a(9) =684a(10) =520a(11) =910a(12) =945a(13) =1616a(14) =1428a(15) =2826a(16) =2489a(17) =3500a(18) =3654a(19) =5346a(20) =4899a(21) =9000a(22) =7175a(23) =10010a(24) =9909a(25) =14028a(26) =13050a(27) =21960a(28) =17577a(29) =23552