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 A320684 #4 Oct 19 2018 10:30:58 %S A320684 0,2,12,47,169,477,1169,2504,5083,10060,19531,36004,62654,103326, %T A320684 164132,253914,386429,580424,862419,1266725,1839456,2638409,3737879, %U A320684 5226949,7215039,9830238,13228817,17596011,23161194,30200288,39055376,50136943,63946416,81075682 %N A320684 Number of 9-element subsets of [n] having a prime element sum. %H A320684 Alois P. Heinz, <a href="/A320684/b320684.txt">Table of n, a(n) for n = 9..500</a> %Y A320684 Column k=9 of A282516. %K A320684 nonn %O A320684 9,2 %A A320684 _Alois P. Heinz_, Oct 19 2018