Number of 4-connected simplicial polyhedra with n nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =4a(7) =10a(8) =25a(9) =87a(10) =313a(11) =1357a(12) =6244a(13) =30926a(14) =158428a(15) =836749a(16) =4504607a(17) =24649284a(18) =136610879a(19) =765598927a(20) =4332047595a(21) =24724362117a(22) =142205424580a(23) =823687567019