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 A121157 #6 May 24 2018 18:02:29 %S A121157 1,1,7,21,93,319,1170,3931,13168,42365,134372,416765,1275718,3850137, %T A121157 11501014,34025545,99891325,291245242,844287970,2435145974,6993264128, %U A121157 20007298353,57051831889,162217819731,460079126428,1301975691316,3677269460008,10368105592318 %N A121157 Number of monocyclic skeletons with n carbon atoms and a ring size of 10. %D A121157 Camden A. Parks and James B. Hendrickson, Enumeration of monocyclic and bicyclic carbon skeletons, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991). %H A121157 Andrew Howroyd, <a href="/A121157/b121157.txt">Table of n, a(n) for n = 10..200</a> %Y A121157 Column k=10 of A305059. %K A121157 nonn %O A121157 10,3 %A A121157 _Parthasarathy Nambi_, Aug 13 2006 %E A121157 Terms a(26) and beyond from _Andrew Howroyd_, May 24 2018