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 A121071 #6 Mar 05 2020 23:54:57 %S A121071 0,0,2,6,32,132,600,2628,11768,52608,237266 %N A121071 Nonisomorphic catacondensed monoheptafusenes (see reference for precise definition). %D A121071 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 A121071 S. J. Cyvin et al., Enumeration and classification of certain polygonal systems... : annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180. %F A121071 See A044046 for g.f. and other formulas. %Y A121071 Equals twice A044046. %K A121071 nonn %O A121071 0,3 %A A121071 _N. J. A. Sloane_