"BHK" (reversible, identity, unlabeled) transform of 1,3,5,7...

Terms

a(0) =1a(1) =3a(2) =8a(3) =18a(4) =54a(5) =152a(6) =472a(7) =1410a(8) =4310a(9) =12952a(10) =39144a(11) =117554a(12) =353590a(13) =1061208a(14) =3186488a(15) =9560866a(16) =28691286a(17) =86078168a(18) =258260680a(19) =774795090a(20) =2324463926a(21) =6973431064a(22) =20920529304a(23) =62761705922a(24) =188285826262a(25) =564857832984