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 A023481 #14 Jul 08 2025 17:19:36 %S A023481 -39,-38,-37,-36,-35,-34,-33,-32,-31,-30,-29,-28,-27,-26,-25,-24,-23, %T A023481 -22,-21,-20,-19,-18,-17,-16,-15,-14,-13,-12,-11,-10,-9,-8,-7,-6,-5, %U A023481 -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 %N A023481 n-39. %H A023481 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A023481 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A023481 a(n) = -A022995(n). G.f.: (-39 + 40*x)/(1 - x)^2. - _M. F. Hasler_, Apr 18 2015 %p A023481 A023481 := n -> n-39; # _M. F. Hasler_, Apr 18 2015 %t A023481 Range[0,60]-39 (* _M. F. Hasler_, Apr 18 2015 *) %o A023481 (PARI) a(n)=n-39 \\ _Charles R Greathouse IV_, Oct 07 2015 %Y A023481 Cf. A256958, A001057, A000027, A001477, A023443, ..., A023480, A023482, A022958, ..., A022996. %K A023481 sign,easy %O A023481 0,1 %A A023481 _N. J. A. Sloane_