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 A345218 #8 Jun 11 2021 13:42:16 %S A345218 1,1,3,19,207,3571,93243,3603139,203658087,16725737971,1985745828483, %T A345218 339119822487139,82867477502576847,28816562818537878931, %U A345218 14182270437347915240523,9825699599254424454332419 %N A345218 Number of labeled triangle-free connected simple graphs on n vertices. %C A345218 LOG transform of A213434. %C A345218 Labeled version of A024607. %Y A345218 Cf. A024607, A213434. %K A345218 nonn,hard %O A345218 1,3 %A A345218 _Brendan McKay_, Jun 11 2021