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 A202693 #17 Jun 04 2020 01:53:52 %S A202693 1,1,2,8,7,5,26,34,41,46,352,326,292,251,205 %N A202693 The second of three triangles counting 3-colored alternating permutations by their last value. %H A202693 M. Josuat-Verges, J.-C. Novelli and J.-Y. Thibon, <a href="http://arxiv.org/abs/1110.5272">The algebraic combinatorics of snakes</a>, arXiv preprint arXiv:1110.5272 [math.CO], 2011. %e A202693 Triangle begins: %e A202693 1 %e A202693 1 2 %e A202693 8 7 5 %e A202693 26 34 41 46 %e A202693 352 326 292 251 205 %e A202693 ... %Y A202693 See A202692 for further information. %Y A202693 Cf. A202694. %K A202693 nonn,tabl,more %O A202693 1,3 %A A202693 _N. J. A. Sloane_, Dec 23 2011