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 A140290 #12 Jan 02 2024 09:04:04 %S A140290 -1,2,-4,9,-25,82,-284,969,-3185,10082,-30964,93129,-276745,818482, %T A140290 -2421644,7188489,-21428705,64121282,-192388324,578087049,-1737827065, %U A140290 5223134482,-15690187004,47105428809,-141351839825,424023394082,-1271763913684 %N A140290 Fourth quadrisection of A140287. %H A140290 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (-7,-17,-15). %F A140290 a(n)=-7a(n-1)-17a(n-2)-15a(n-3). %F A140290 G.f.: -(7*x^2+5*x+1)/((3*x+1)*(5*x^2+4*x+1)). - _Colin Barker_, Jul 10 2012 %Y A140290 Cf. A127055; . %K A140290 sign,easy %O A140290 0,2 %A A140290 _Paul Curtz_, May 24 2008 %E A140290 More terms from _Colin Barker_, Jul 10 2012