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 A125673 #3 Mar 30 2012 17:25:50 %S A125673 1,3,15,57,231,853,3131,11007 %N A125673 Classification of bicyclics with the parameter 'alpha' having the value of 4. See the paper by Hendrickson and Parks for details. %C A125673 Here 'alpha' is the number of atoms the two rings have in common. %D A125673 James B. Hendrickson and Camden A. Parks, "Generation and Enumeration of Carbon Skeletons", J. Chem. Inf. Comput. Sci., vol. 31 (1991), pp. 101-107. See Table VII column 6 on page 104. %e A125673 If n=8 then the number of bicyclics when 'alpha' = four is 1. %e A125673 If n=9 then the number of bicyclics when 'alpha' = four is 3. %e A125673 If n=10 then the number of bicyclics when 'alpha' = four is 15. %e A125673 If n=11 then the number of bicyclics when 'alpha' = four is 57. %Y A125673 Cf. A121330, A121331, A121332, A121333, A125064. %K A125673 nonn %O A125673 8,2 %A A125673 _Parthasarathy Nambi_, Jan 29 2007