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 A102219 #11 Feb 16 2025 08:32:55 %S A102219 9,16,24,27,28,32,40,42,49,52,56,60,70,72,76,78,80,81,88,91,98,100, %T A102219 104,105,114,124,126,130,132,133,136,140,148,150,152,154,169,172,175, %U A102219 176,180,182,184,186,190,192,195,200,204,216,217,220,222,231,232,234 %N A102219 3-Monica numbers. %C A102219 See A177927 for a better version. %H A102219 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MonicaSet.html">Monica Set</a> %Y A102219 Cf. A018252, A102218, A177927. %K A102219 nonn %O A102219 1,1 %A A102219 _Eric W. Weisstein_, Dec 30 2004