Number of isomorphism classes of nanocones with 3 pentagons and a symmetric boundary of length n.

Terms

a(0) =1a(1) =3a(2) =5a(3) =12a(4) =18a(5) =31a(6) =44a(7) =67a(8) =88a(9) =124a(10) =157a(11) =207a(12) =255a(13) =323a(14) =387a(15) =476a(16) =560a(17) =671a(18) =778a(19) =915a(20) =1046a(21) =1212a(22) =1371a(23) =1567a(24) =1757a(25) =1987a(26) =2209a(27) =2476a(28) =2734a(29) =3039