Stereoisomeric homologs with molecular formula C_{3+n} H_{6+2n}.

Terms

a(0) =1a(1) =1a(2) =5a(3) =11a(4) =33a(5) =87a(6) =259a(7) =730a(8) =2150a(9) =6278a(10) =18622a(11) =55340a(12) =165857a(13) =498907a(14) =1509012a(15) =4581570a(16) =13967031a(17) =42722777a(18) =131110259a(19) =403527667a(20) =1245358416a(21) =3852965298a(22) =11948207174a(23) =37131355170a(24) =115623660978a(25) =360712069084