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 A022974 #16 Jul 29 2024 03:46:40 %S A022974 18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,-1,-2,-3,-4,-5,-6,-7, %T A022974 -8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18,-19,-20,-21,-22,-23,-24, %U A022974 -25,-26,-27,-28,-29,-30,-31,-32,-33,-34,-35,-36,-37,-38,-39,-40,-41,-42 %N A022974 a(n) = 18-n. %H A022974 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>. %H A022974 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2, -1). %F A022974 a(n) = 2*a(n-1) - a(n-2). - _Wesley Ivan Hurt_, Mar 15 2023 %t A022974 18-Range[0,60] (* _Harvey P. Dale_, Jan 15 2012 *) %Y A022974 Cf. A022958 - A022995. %K A022974 sign %O A022974 0,1 %A A022974 _N. J. A. Sloane_