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 A121333 #3 Mar 30 2012 16:50:30 %S A121333 0,0,0,1,6,32,140,567,2141,7731,26929,91269,302566,985178,3160480, %T A121333 10013151,31390529,97519183,300596765,920275456,2800635344 %N A121333 Number of bridged bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition). %D A121333 Camden A. Parks and James B. Hendrickson, Enumeration of monocyclic and bicyclic carbon skeletons, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991). %K A121333 nonn %O A121333 5,5 %A A121333 _N. J. A. Sloane_, Aug 27 2006