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 A226299 #9 Jul 11 2022 14:21:34 %S A226299 1,25,540,11760,268365,6495345 %N A226299 Number of primitive permutations with n buds and 6 red or blue elements. %H A226299 Adrian Ocneanu, <a href="http://arxiv.org/abs/1304.1263">On the inner structure of a permutation: bicolored partitions and Eulerians, trees and primitives</a>, arXiv preprint arXiv:1304.1263 [math.CO], 2013. %K A226299 nonn,more %O A226299 0,2 %A A226299 _N. J. A. Sloane_, Jun 05 2013