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 A323452 #17 Jul 26 2022 17:48:10 %S A323452 1,1,1,1,4,15,35,77,226,1003,4627,22195,107764,553107,3219398, %T A323452 20940662,146173751,1077052928 %N A323452 First differences of A323289. %H A323452 Rémy Sigrist, <a href="/A323452/a323452.cs.txt">C# program</a> %o A323452 (C#) See Links section. %Y A323452 Cf. A323286-A323289. %K A323452 nonn,base,more %O A323452 1,5 %A A323452 _N. J. A. Sloane_, Jan 15 2019 %E A323452 a(7)-a(16) from _Rémy Sigrist_, Jan 15 2019 %E A323452 a(17) from _Michael S. Branicky_, Jul 24 2022 %E A323452 a(18) from _Michael S. Branicky_, Jul 26 2022