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 A045904 #9 Mar 08 2020 03:34:12 %S A045904 0,0,0,1,5,31,160,825,4074,19902,95920 %N A045904 Nonisomorphic catacondensed monoheptafusenes (see reference for precise definition). %D A045904 B. N. Cyvin et al., A class of polygonal systems representing polycyclic conjugated hydrocarbons ..., Monat. f. Chemie, 125 (1994), 1327-1337 (see Table 1). %D A045904 S. J. Cyvin et al., Enumeration and classification of certain polygonal systems... : annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180. %Y A045904 3rd column of A121178. %K A045904 nonn %O A045904 0,5 %A A045904 _N. J. A. Sloane_