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 A293998 #4 Oct 21 2017 19:50:48 %S A293998 1,1,3,15,105,945,10395,45045,222951,1245257,7689707,50548041, %T A293998 328681355,1898148921,10938090235,64447508901,388656309623, %U A293998 2372510073525,14406809496311,86092382481933,512757617989667,3064484085534721,18400499270245971,110741448251269561 %N A293998 Number of linear chord diagrams having n chords and no chord length larger than six. %H A293998 Alois P. Heinz, <a href="/A293998/b293998.txt">Table of n, a(n) for n = 0..1000</a> %H A293998 <a href="/index/Rec#order_32">Index entries for linear recurrences with constant coefficients</a>, signature (3, 7, 7, 84, 939, 6095, -4433, -31187, -37164, -140858, -899154, -569580, 741066, 3256828, -1225088, 19146692, -26901488, 28568896, 21503648, -89813600, 175998288, -128442288, 44156064, -18953856, 34648704, 69766272, -7008768, 5868288, -82363392, -80815104, -46448640, -9953280) %Y A293998 Column k=6 of A293960. %K A293998 nonn,easy %O A293998 0,3 %A A293998 _Alois P. Heinz_, Oct 21 2017