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%I #29 Nov 16 2016 06:03:16
%S 0,28,56,84,112,140,168,196,224,252,280,308,336,364,392,420,448,476,
%T 504,532,560,588,616,644,672,700,728,756,784,812,840,868,896,924,952,
%U 980,1008,1036,1064,1092,1120,1148,1176,1204,1232,1260,1288,1316,1344,1372
%N Multiples of 28.
%H G. C. Greubel, <a href="/A135628/b135628.txt">Table of n, a(n) for n = 0..1000</a>
%H Luis Manuel Rivera, <a href="http://arxiv.org/abs/1406.3081">Integer sequences and k-commuting permutations</a>, arXiv preprint arXiv:1406.3081 [math.CO], 2014.
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1)
%F a(n) = 28*n.
%F From _G. C. Greubel_, Oct 24 2016: (Start)
%F G.f.: (28*x)/(1 - x)^2.
%F E.g.f.: 28*x*exp(x).
%F a(n) = 2*a(n-1) - a(n-2). (End)
%e a(9) = 28*9 = 252.
%t Range[0, 3000, 28] (* _Vladimir Joseph Stephan Orlovsky_, Jun 03 2011 *)
%t LinearRecurrence[{2,-1},{0,28},25] (* _G. C. Greubel_, Oct 24 2016 *)
%Y Cf. A008588, A008596, A127777.
%K easy,nonn
%O 0,2
%A _Omar E. Pol_, Nov 25 2007
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