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 A033287 #5 Jul 08 2025 19:50:33 %S A033287 4,9,13,27,23,41,33,55,83,51,103,89,69,103,143,155,95,175,147,113,205, %T A033287 171,227,289,201,155,215,165,229,547,255,329,205,489,221,373,385,319, %U A033287 407,419,263,611,279,373,289,763 %N A033287 First differences of A033286. %K A033287 nonn %O A033287 0,1 %A A033287 _N. J. A. Sloane_