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 A065812 #5 Sep 15 2023 20:13:52 %S A065812 0,1,2,3,4,15,16,21,22,26,37,41,42,46,50,77,81,87,103,108,116,117,121, %T A065812 134,138,139,147,152,168,190,194,220,228,255,256,283,291,317,321,352, %U A065812 375,477,506,517,546,648,671,683,713,811,819,837,853,857,892,900,921 %N A065812 a(n) = A065811(n)/3. %K A065812 nonn %O A065812 1,3 %A A065812 _Antti Karttunen_, Nov 22 2001