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 A128242 #22 Jun 24 2023 13:42:05 %S A128242 0,0,1,1,5,16,66,266,1235,6350,37364,251106,1942085,17287710, %T A128242 177086792,2084120446,28125888087,434318629496,7657513894860 %N A128242 Number of n-node (unlabeled) connected graphs with girth 5. %o A128242 (nauty) geng -ctfq $n | countg -qg5 --ng # _Martin Fuller_, May 03 2015 %Y A128242 Cf. A128041, A128042. %Y A128242 Cf. A128236, A128237, A128238, A128239, A128240, A128241, A128243. %K A128242 nonn,more %O A128242 3,5 %A A128242 _Keith Briggs_, May 05 2007 %E A128242 Corrected and extended by _Martin Fuller_, May 01 2015 %E A128242 a(18)-a(21) added by _Georg Grasegger_, May 02 2023