a(n) is the number of edges formed by n-secting the angles of a pentagon.

Terms

a(0) =5a(1) =20a(2) =20a(3) =105a(4) =265a(5) =160a(6) =555a(7) =575a(8) =650a(9) =965a(10) =1415a(11) =1085a(12) =1965a(13) =2050a(14) =2170a(15) =2680a(16) =3445a(17) =2410a(18) =4275a(19) =4370a(20) =4620a(21) =5315a(22) =6355a(23) =5605a(24) =7495a(25) =7625a(26) =7910a(27) =8870a(28) =10175a(29) =9125