Number of plane regions after drawing (in general position) a convex n-gon and all its diagonals.

Terms

a(0) =1a(1) =2a(2) =5a(3) =12a(4) =26a(5) =51a(6) =92a(7) =155a(8) =247a(9) =376a(10) =551a(11) =782a(12) =1080a(13) =1457a(14) =1926a(15) =2501a(16) =3197a(17) =4030a(18) =5017a(19) =6176a(20) =7526a(21) =9087a(22) =10880a(23) =12927a(24) =15251a(25) =17876a(26) =20827a(27) =24130a(28) =27812a(29) =31901