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 A101805 #10 Feb 16 2025 08:32:55 %S A101805 2,4,7,20,57,149,523,1835,6810,26222,106670,444085 %N A101805 Number of Ruth-Aaron numbers (with multiplicity) less than 10^n. %H A101805 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Ruth-AaronPair.html">Ruth-Aaron Pair</a> %Y A101805 Cf. A039752. %K A101805 nonn,more %O A101805 1,1 %A A101805 _Eric W. Weisstein_, Dec 16 2004 %E A101805 Offset corrected and a(9)-a(12) from _Donovan Johnson_, Dec 14 2010