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 A128243 #23 Jun 24 2023 13:42:13 %S A128243 0,0,0,1,1,6,17,69,239,962,3864,17049,79607,403758,2209386,13138818, %T A128243 84841130,595825731 %N A128243 Number of n-node (unlabeled) connected graphs with girth 6. %o A128243 (nauty) geng -ctfq $n | countg -qg6 --ng # _Martin Fuller_, May 03 2015 %Y A128243 Cf. A128041, A128042. %Y A128243 Cf. A128236, A128237, A128238, A128239, A128240, A128241, A128242. %K A128243 nonn,more %O A128243 3,6 %A A128243 _Keith Briggs_, May 05 2007 %E A128243 Corrected and extended by _Martin Fuller_, May 01 2015 %E A128243 a(18)-a(20) added by _Georg Grasegger_, May 02 2023