Number of planar strictly 2-connected graphs on n edges.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =15a(8) =39a(9) =106a(10) =316a(11) =1030a(12) =3553a(13) =13006a(14) =49780a(15) =197281a(16) =804649a(17) =3358885a(18) =14289507a(19) =61769577