Number of acyclic secondary alcohols with n carbon atoms.

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =36a(5) =98a(6) =273a(7) =768a(8) =2197a(9) =6360a(10) =18584a(11) =54780a(12) =162672a(13) =486154a(14) =1461197a(15) =4413988a(16) =13393855a(17) =40807290a(18) =124783669a(19) =382842018a(20) =1178140280a(21) =3635626680a(22) =11247841224a(23) =34880346840a(24) =108402132544a(25) =337576497920