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 A121160 #8 Apr 04 2024 12:45:03 %S A121160 1,1,6,12,43,106,322,864,2483,6829,19226,53293,148866,413501,1151506, %T A121160 3200184,8901478,24742852,68800520,191275736,531888416 %N A121160 Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition). %H A121160 Camden A. Parks and James B. Hendrickson, <a href="https://doi.org/10.1021/ci00002a021">Enumeration of monocyclic and bicyclic carbon skeletons</a>, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991). %K A121160 nonn,more %O A121160 5,3 %A A121160 _Parthasarathy Nambi_, Aug 13 2006 %E A121160 More terms from _N. J. A. Sloane_, Aug 27 2006