Number of polypons with n cells.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =10a(6) =13a(7) =29a(8) =47a(9) =100a(10) =181a(11) =383a(12) =738a(13) =1539a(14) =3087a(15) =6419a(16) =13135a(17) =27402a(18) =56779a(19) =118876a(20) =248384a(21) =521850a(22) =1096261a(23) =2310793a(24) =4874305a(25) =10305560a(26) =21810868a(27) =46239224