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 A022995 #16 Jul 29 2024 09:15:48 %S A022995 39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17, %T A022995 16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,-1,-2,-3,-4,-5,-6,-7,-8,-9, %U A022995 -10,-11,-12,-13,-14,-15,-16,-17,-18,-19,-20,-21 %N A022995 a(n) = 39 - n. %C A022995 If we extend this sequence to negative n, then we have a permutation of the integers. - _Alonso del Arte_, Aug 02 2017 %H A022995 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>. %H A022995 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A022995 a(n) = -n + 39. %t A022995 39 - Range[0, 59] (* _Alonso del Arte_, Aug 02 2017 *) %Y A022995 Cf. A022958 - A022996. %K A022995 sign,easy %O A022995 0,1 %A A022995 _N. J. A. Sloane_