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 A135092 #28 Nov 03 2018 08:44:17 %S A135092 1,7,14,28,56,112,224,448,896,1792,3584,7168,14336,28672,57344,114688, %T A135092 229376,458752,917504,1835008,3670016,7340032,14680064,29360128, %U A135092 58720256,117440512,234881024,469762048,939524096,1879048192,3758096384,7516192768,15032385536 %N A135092 Binomial transform of [1, 6, 1, 6, 1, 6, ...]. %H A135092 Vincenzo Librandi, <a href="/A135092/b135092.txt">Table of n, a(n) for n = 0..3000</a> %H A135092 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (2). %F A135092 a(n) = 7*2^(n-1) for n>0, a(0)=1. %F A135092 a(n) = Sum_{k=0..n} A097805(n,k)*7^k*(-5)^(n-k). - _Philippe Deléham_, Nov 19 2007 %F A135092 G.f.: (1+5*x)/(1-2*x). - _Bruno Berselli_, Sep 20 2011 %F A135092 E.g.f.: (1/2)*(7*exp(2*x) - 5). - _G. C. Greubel_, Sep 22 2016 %F A135092 a(n) = A125176(n+2) for n >= 1. - _Georg Fischer_, Nov 02 2018 %e A135092 a(3) = (1, 3, 3, 1) dot (1, 6, 1, 6) = (1 + 18 + 3 + 6) = 28 = 7*2^2. %t A135092 Join[{1},NestList[2#&,7,50]] (* _Harvey P. Dale_, Aug 30 2015 *) %Y A135092 Essentially identical to A005009 and to A125176. %K A135092 nonn,easy %O A135092 0,2 %A A135092 _Gary W. Adamson_, Nov 18 2007 %E A135092 Corrected and extended by _Philippe Deléham_ and _N. J. A. Sloane_, Dec 15 2007