Number of cubic plane graphs with 2n nodes, minimal face size 4 and maximal face size 6.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =4a(6) =7a(7) =10a(8) =22a(9) =32a(10) =58a(11) =92a(12) =151a(13) =227a(14) =368a(15) =530a(16) =805a(17) =1158a(18) =1695a(19) =2373a(20) =3354a(21) =4595a(22) =6340a(23) =8480a(24) =11417a(25) =15049a(26) =19832a(27) =25719a(28) =33258a(29) =42482