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 A293999 #4 Oct 21 2017 19:54:52 %S A293999 1,1,3,15,105,945,10395,135135,675675,3790647,23694083,162961399, %T A293999 1209395171,9332799283,70178707279,474578729935,3181796735723, %U A293999 21683288205723,150990425051331,1069361164106091,7617764489275535,53863160510249543,375786310609620379 %N A293999 Number of linear chord diagrams having n chords and no chord length larger than seven. %H A293999 Alois P. Heinz, <a href="/A293999/b293999.txt">Table of n, a(n) for n = 0..1000</a> %Y A293999 Column k=7 of A293960. %K A293999 nonn,easy %O A293999 0,3 %A A293999 _Alois P. Heinz_, Oct 21 2017