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 A023453 #18 Jul 08 2025 17:16:47 %S A023453 -11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13, %T A023453 14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36, %U A023453 37,38,39,40,41,42,43,44,45,46,47,48,49 %N A023453 a(n) = n-11. %H A023453 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A023453 Robert G. Wilson v, <a href="/A001477/a001477.txt">American English names for the numbers from 0 to 100999 without spaces or hyphens</a>. %H A023453 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %t A023453 Range[0,60]-11 (* _Harvey P. Dale_, Aug 17 2016 *) %o A023453 (PARI) a(n)=n-11 %K A023453 sign,easy %O A023453 0,1 %A A023453 _N. J. A. Sloane_