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 A023480 #10 Jul 08 2025 17:19:30 %S A023480 -38,-37,-36,-35,-34,-33,-32,-31,-30,-29,-28,-27,-26,-25,-24,-23,-22, %T A023480 -21,-20,-19,-18,-17,-16,-15,-14,-13,-12,-11,-10,-9,-8,-7,-6,-5,-4,-3, %U A023480 -2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22 %N A023480 n-38. %H A023480 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A023480 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A023480 a(n) = 2 a(n-1) - a(n-2). a(n) = -A022994(n) = A256958(n-38). G.f.: (-38 + 39*x)/(1 - x)^2. - _M. F. Hasler_, Apr 18 2015 %p A023480 A023480 := n -> n-38; # _M. F. Hasler_, Apr 18 2015 %t A023480 Range[0,60]-38 (* _M. F. Hasler_, Apr 18 2015 *) %o A023480 (PARI) a(n)=n-38 \\ _M. F. Hasler_, Apr 18 2015 %Y A023480 Cf. A256958, A001057, A000027, A001477, A023443, ..., A023479, A023481, A023482, A022958, ..., A022996. %K A023480 sign,easy %O A023480 0,1 %A A023480 _N. J. A. Sloane_