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 A035007 #11 Mar 06 2025 10:16:06 %S A035007 0,4,20,56,120,220,364,560,816,1140,1540,2024,2600,3276,4060,4960,5984 %N A035007 Duplicate of A002492. %K A035007 dead %O A035007 1,2 %A A035007 _Ray Chandler_, Mar 06 2025