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 A023451 #24 Jul 08 2025 17:16:32 %S A023451 -9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16, %T A023451 17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39, %U A023451 40,41,42,43,44,45,46,47,48,49,50,51 %N A023451 a(n) = n-9. %H A023451 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A023451 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A023451 G.f.: -(9-10*x)/(1-x)^2. - _Bruno Berselli_, Sep 02 2011 %F A023451 a(n) = 2 a(n-1) - a(n-2). a(n) = -A022965(n). - _M. F. Hasler_, Apr 18 2015 %p A023451 A023451 := n -> n-9; # _M. F. Hasler_, Apr 18 2015 %t A023451 Range[0,60]-9 (* _Harvey P. Dale_, Jan 15 2015 *) %o A023451 (PARI) a(n)=n-9 %Y A023451 Cf. A256958, A001057, A000027, A001477, A023443, ..., A023450, A023452, ..., A023482, A022958, ..., A022996. %Y A023451 The negative of A022965. %K A023451 sign,easy %O A023451 0,1 %A A023451 _N. J. A. Sloane_