Number of intersections of diagonals in the interior of a regular p-gon where p is the n-th prime.

Terms

a(0) =0a(1) =0a(2) =5a(3) =35a(4) =330a(5) =715a(6) =2380a(7) =3876a(8) =8855a(9) =23751a(10) =31465a(11) =66045a(12) =101270a(13) =123410a(14) =178365a(15) =292825a(16) =455126a(17) =521855a(18) =766480a(19) =971635a(20) =1088430a(21) =1502501a(22) =1837620a(23) =2441626a(24) =3464840a(25) =4082925a(26) =4421275a(27) =5160610a(28) =5563251a(29) =6438740