Number of monosubstituted alkanes C(n-1)H(2n-1)-X with n-1 carbon atoms that are not stereoisomers.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =8a(7) =14a(8) =23a(9) =39a(10) =65a(11) =110a(12) =184a(13) =310a(14) =520a(15) =876a(16) =1471a(17) =2475a(18) =4159a(19) =6996a(20) =11759a(21) =19775a(22) =33244a(23) =55902a(24) =93984a(25) =158030a(26) =265696a(27) =446746a(28) =751128a(29) =1262940