"BFK" (reversible, size, unlabeled) transform of 1,2,3,4...

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =7a(5) =15a(6) =37a(7) =59a(8) =108a(9) =222a(10) =614a(11) =892a(12) =1799a(13) =3045a(14) =6085a(15) =15988a(16) =23820a(17) =43421a(18) =75990a(19) =132772a(20) =234815a(21) =621314a(22) =875065a(23) =1608843a(24) =2631976a(25) =4602611a(26) =7356750a(27) =13220265a(28) =31805483a(29) =45438961