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 A226298 #9 Jul 11 2022 13:40:53 %S A226298 1,18,309,5628,110781,2361222 %N A226298 Number of primitive permutations with n buds and 5 red or blue elements. %H A226298 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 A226298 nonn,more %O A226298 0,2 %A A226298 _N. J. A. Sloane_, Jun 05 2013