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 A106707 #35 Feb 24 2024 01:11:11 %S A106707 0,-1,-4,-15,-56,-209,-780,-2911,-10864,-40545,-151316,-564719, %T A106707 -2107560,-7865521,-29354524,-109552575,-408855776,-1525870529, %U A106707 -5694626340,-21252634831,-79315912984,-296011017105,-1104728155436,-4122901604639,-15386878263120,-57424611447841 %N A106707 a(n) = -A001353(n). %H A106707 G. C. Greubel, <a href="/A106707/b106707.txt">Table of n, a(n) for n = 0..1000</a> %H A106707 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A106707 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (4,-1). %F A106707 G.f.: -x/(1-4*x+x^2). %F A106707 a(n) = 4*a(n-1) - a(n-2); a(0)=0, a(1)=-1. %p A106707 a[0]:=0: a[1]:=-1: for n from 2 to 27 do a[n]:=4*a[n-1]-a[n-2] od: seq(a[n],n=0..27); %t A106707 LinearRecurrence[{4,-1},{0,-1},30] (* _Harvey P. Dale_, Nov 01 2019 *) %o A106707 (PARI) x='x+O('x^30); Vec(-x/(1-4*x+x^2)) \\ _G. C. Greubel_, Feb 05 2018 %o A106707 (Magma) I:=[0,-1]; [n le 2 select I[n] else 4*Self(n-1) - Self(n-2): n in [1..30]]; // _G. C. Greubel_, Feb 05 2018 %Y A106707 Cf. A001076, A001353. %K A106707 sign,easy,less %O A106707 0,3 %A A106707 _Roger L. Bagula_, May 30 2005 %E A106707 Edited by _N. J. A. Sloane_, Apr 30 2006 %E A106707 New name from _Joerg Arndt_, Sep 22 2023