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 A023449 #21 Jul 08 2025 17:16:18 %S A023449 -7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18, %T A023449 19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41, %U A023449 42,43,44,45,46,47,48,49,50,51,52 %N A023449 n-7. %H A023449 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A023449 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 A023449 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A023449 a(n) = 2 a(n-1) - a(n-2). a(n) = -A022963(n). G.f.: (-7+8*x)/(1-x)^2. - _M. F. Hasler_, Apr 18 2015 %p A023449 A023449 := n -> n-7; # _M. F. Hasler_, Apr 18 2015 %t A023449 Range[0,60]-7 (* _Harvey P. Dale_, Nov 15 2012 *) %o A023449 (PARI) a(n)=n-7 %Y A023449 Cf. A256958, A001057, A000027, A001477, A023443, ..., A023448, A023450, ..., A023482, A022958, ..., A022996. %K A023449 sign,easy %O A023449 0,1 %A A023449 _N. J. A. Sloane_