Number of connected planar graphs with n edges.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =12a(6) =30a(7) =79a(8) =227a(9) =709a(10) =2318a(11) =8049a(12) =29372a(13) =112000a(14) =444855a(15) =1833072a(16) =7806724a(17) =34252145a(18) =154342391a(19) =712231465a(20) =3357126655a(21) =16119421175a(22) =78580665333