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 A173017 #4 Jun 02 2025 02:41:06 %S A173017 1,4,7,19,25,56,73,144,180,346,430,826 %N A173017 A006987(a(n))=A000984(n). %K A173017 nonn %O A173017 2,2 %A A173017 _Dylan Hamilton_, Nov 06 2010