This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A005955 M1453 #19 Jul 08 2025 16:39:31 %S A005955 1,2,5,14,36,98,273,768,2197,6360,18584,54780,162672,486154,1461197, %T A005955 4413988,13393855,40807290,124783669,382842018,1178140280,3635626680, %U A005955 11247841224,34880346840,108402132544,337576497920,1053229358252,3291813720292 %N A005955 Number of acyclic secondary alcohols with n carbon atoms. %D A005955 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A005955 R. C. Read, <a href="/A000598/a000598.pdf">The Enumeration of Acyclic Chemical Compounds</a>, pp. 25-61 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976. [Annotated scanned copy] See p. 44. %F A005955 G.f. x*(B(x)-1)^2 where B(x) is the g.f. for A000625. - _Sean A. Irvine_, Nov 12 2016 %e A005955 G.f. = x^3 + 2*x^4 + 5*x^5 + 14*x^6 + 36*x^7 + 98*x^8 + 273*x^9 + ... %Y A005955 Cf. A000625. %K A005955 nonn %O A005955 3,2 %A A005955 _N. J. A. Sloane_ %E A005955 More terms from _Sean A. Irvine_, Nov 12 2016