Number of secondary alcohols (alkanols or alkyl alcohols C_n H_{2n+1} OH) with n carbon atoms.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =3a(5) =6a(6) =15a(7) =33a(8) =82a(9) =194a(10) =482a(11) =1188a(12) =2988a(13) =7528a(14) =19181a(15) =49060a(16) =126369a(17) =326863a(18) =849650a(19) =2216862a(20) =5806256a(21) =15256265a(22) =40210657a(23) =106273050a(24) =281593237a(25) =747890675a(26) =1990689459a(27) =5309397294a(28) =14187485959a(29) =37977600390