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 A139760 #22 Feb 27 2024 03:05:16
%S A139760 1,9,137,2185,34953,559241,8947849,143165577,2290649225,36650387593,
%T A139760 586406201481,9382499223689,150119987579017,2401919801264265,
%U A139760 38430716820228233,614891469123651721,9838263505978427529,157412216095654840457,2518595457530477447305
%N A139760 First quadrisection of A115451.
%H A139760 Vincenzo Librandi, <a href="/A139760/b139760.txt">Table of n, a(n) for n = 0..500</a>
%H A139760 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (17,-16)
%F A139760 a(n) = 16*a(n-1) - 7.
%F A139760 G.f.: ( 1-8*x ) / ( (16*x-1)*(x-1) ). - _R. J. Mathar_, Feb 06 2011
%t A139760 LinearRecurrence[{17,-16},{1,9},20] (* _Harvey P. Dale_, Apr 02 2018 *)
%o A139760 (Magma) [(7+8*16^n)/15: n in [0..20]]; // _Vincenzo Librandi_, Aug 09 2011
%K A139760 nonn,easy
%O A139760 0,2
%A A139760 _Paul Curtz_, May 20 2008