Number of unlabeled graphs with n equal to the number of vertices plus the number of edges.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =5a(6) =7a(7) =10a(8) =16a(9) =25a(10) =40a(11) =66a(12) =111a(13) =191a(14) =343a(15) =627a(16) =1182a(17) =2301a(18) =4609a(19) =9511a(20) =20229a(21) =44252a(22) =99564a(23) =230171a(24) =546118a(25) =1328476a(26) =3309876a(27) =8436887a(28) =21980376a(29) =58473130