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 A002004 M3328 N1339 #31 Jul 08 2025 16:27:26 %S A002004 1,4,8,12,17,22,27,32,37,42,47,53,58,64,69,75,81,86,92,98,104 %N A002004 Davenport-Schinzel numbers of degree 4 on n symbols. %D A002004 R. K. Guy, Unsolved Problems in Number Theory, E20. %D A002004 D. P. Roselle and R. G. Stanton, Results on Davenport-Schinzel sequences, pp. 249-267 in Proceedings of the Louisiana Conference on Combinatorics, Graph Theory and Computer Science. Vol. 1, edited R. C. Mullin et al., 1970. %D A002004 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002004 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %D A002004 R. G. Stanton and P. H. Dirksen, Davenport-Schinzel sequences, Ars. Combin., 1 (1976), 43-51. %H A002004 R. G. Stanton and P. H. Dirksen, <a href="/A002004/a002004.pdf">Davenport-Schinzel sequences</a>, Ars. Combin., 1 (1976), 43-51. [Annotated scanned copy] %H A002004 R. G. Stanton and P. H. Dirksen, <a href="/A002004/a002004_1.pdf">Davenport-Schinzel sequences</a>, Ars. Combin., 1 (1976), 43-51. [Annotated scanned copy, different annotations from one above] %H A002004 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Davenport-SchinzelSequence.html">Davenport-Schinzel Sequence.</a> %Y A002004 A column of array in A259874. %K A002004 nonn,nice,more %O A002004 1,2 %A A002004 _N. J. A. Sloane_ %E A002004 Title improved by _Sean A. Irvine_, Feb 19 2016