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 A140289 #15 Jan 02 2024 09:04:00
%S A140289 0,0,1,-7,32,-120,401,-1247,3712,-10800,31201,-90487,264992,-784680,
%T A140289 2345201,-7051727,21263872,-64145760,193310401,-581652967,1747480352,
%U A140289 -5243918040,15725054801,-47140982207,141319714432,-423717125520,1270699466401,-3811500847447,11434371886112,-34305580792200,102927256193201,-308811498176687
%N A140289 First quadrisection of A140287.
%H A140289 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (-7,-17,-15).
%F A140289 a(n)=-7a(n-1)-17a(n-2)-15a(n-3).
%F A140289 G.f.: x^2/((3*x + 1)*(5*x^2 + 4*x + 1)). - _Colin Barker_, Jul 10 2012
%t A140289 LinearRecurrence[{-7,-17,-15},{0,0,1},40] (* _Harvey P. Dale_, Mar 16 2015 *)
%K A140289 sign,easy
%O A140289 0,4
%A A140289 _Paul Curtz_, May 24 2008
%E A140289 More terms from _Colin Barker_, Jul 10 2012