Number of esters with n carbon atoms up to stereo-isomerism.

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =25a(5) =64a(6) =172a(7) =472a(8) =1319a(9) =3750a(10) =10796a(11) =31416a(12) =92276a(13) =273172a(14) =814246a(15) =2441688a(16) =7360877a(17) =22295746a(18) =67819576a(19) =207083944a(20) =634512581a(21) =1950301202a(22) =6011920720a(23) =18581123978a(24) =57568802820a(25) =178763375468a(26) =556255762692