Number of pentagonal regions in regular n-gon with all diagonals drawn.

Terms

a(0) =1a(1) =0a(2) =7a(3) =0a(4) =18a(5) =10a(6) =44a(7) =0a(8) =117a(9) =98a(10) =150a(11) =128a(12) =357a(13) =72a(14) =646a(15) =580a(16) =903a(17) =814a(18) =1564a(19) =840a(20) =2050a(21) =2106a(22) =2862a(23) =2128a(24) =3625a(25) =1440a(26) =5146a(27) =4896a(28) =6105a(29) =5542