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 A023446 #18 Jul 08 2025 17:16:06 %S A023446 -4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21, %T A023446 22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44, %U A023446 45,46,47,48,49,50,51,52,53,54 %N A023446 n-4. %H A023446 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A023446 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 A023446 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A023446 a(n) = 2 a(n-1) - a(n-2). a(n) = -A022960(n). G.f.: -(4-5*x)/(1-x)^2. - M. F. Hasler, Apr 18 2015 %t A023446 Range[0,60]-4 (* _Harvey P. Dale_, Sep 17 2022 *) %o A023446 (PARI) a(n)=n-4 %Y A023446 Cf. A256958, A001057, A000027, A001477, A023443, A023444, A023445, A023447, ..., A023482, A022958, ..., A022996. %K A023446 sign,easy %O A023446 0,1 %A A023446 _N. J. A. Sloane_