Numbers of facially complete 2-connected planar embeddings.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =6a(5) =15a(6) =32a(7) =94a(8) =295a(9) =1169a(10) =4870a(11) =22110a(12) =102490a(13) =489479a(14) =2370856a(15) =11655722a(16) =57918613a(17) =290697549a(18) =1471349079a(19) =7504192109a(20) =38532719288a(21) =199076246027