Number of isomorphism classes of nanocones with 4 pentagons and a symmetric boundary of length n.

Terms

a(0) =1a(1) =4a(2) =16a(3) =37a(4) =89a(5) =175a(6) =336a(7) =579a(8) =975a(9) =1533a(10) =2363a(11) =3477a(12) =5030a(13) =7040a(14) =9716a(15) =13078a(16) =17400a(17) =22707a(18) =29342a(19) =37336a(20) =47112a(21) =58705a(22) =72627a(23) =88918a(24) =108185a(25) =130476a(26) =156502a(27) =186315a(28) =220741a(29) =259839