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 A345216 #11 Jan 15 2023 01:45:09 %S A345216 1,2,4,11,26,80,251,929,3727,17565,95428,629795,5171063,55857762, %T A345216 831428458,17625946914 %N A345216 Number of simple graphs on n nodes with no cycle of length 5. %C A345216 EULER transformation of A241784. %Y A345216 Cf. A241784. %K A345216 nonn,more %O A345216 1,2 %A A345216 _Brendan McKay_, Jun 10 2021