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 A131842 #16 Apr 16 2022 16:46:21 %S A131842 1,1,2,6,20,96,582,4672,47330,595680,9088942,164702708,3483060060, %T A131842 84705352206,2339732572312,72635597193630,2511496037777828, %U A131842 95965484116697442,4024669707807276532,184149183428282681030,9143767110701151656280 %N A131842 First differences of A007097. %D A131842 L. Longeri, Towards understanding nature and the aesthetics of prime numbers, https://www.longeri.org/prime/nature.html [Broken link, but leave the URL here for historical reasons] %K A131842 nonn %O A131842 0,3 %A A131842 Luis Longeri (longeri.nature(AT)gmail.com), Oct 04 2007 %E A131842 a(17) and a(18) found by _David Baugh_ using a program by Xavier Gourdon and _Andrey V. Kulsha_, Oct 25 2007 %E A131842 a(19) found by _Andrey V. Kulsha_ using a program by Xavier Gourdon, Sep 29 2011 %E A131842 a(20) found by _Andrey V. Kulsha_ using a program by Xavier Gourdon, Oct 02 2011