A135628 Multiples of 28.
0, 28, 56, 84, 112, 140, 168, 196, 224, 252, 280, 308, 336, 364, 392, 420, 448, 476, 504, 532, 560, 588, 616, 644, 672, 700, 728, 756, 784, 812, 840, 868, 896, 924, 952, 980, 1008, 1036, 1064, 1092, 1120, 1148, 1176, 1204, 1232, 1260, 1288, 1316, 1344, 1372
Offset: 0
Examples
a(9) = 28*9 = 252.
Links
- G. C. Greubel, Table of n, a(n) for n = 0..1000
- Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081 [math.CO], 2014.
- Index entries for linear recurrences with constant coefficients, signature (2,-1)
Programs
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Mathematica
Range[0, 3000, 28] (* Vladimir Joseph Stephan Orlovsky, Jun 03 2011 *) LinearRecurrence[{2,-1},{0,28},25] (* G. C. Greubel, Oct 24 2016 *)
Formula
a(n) = 28*n.
From G. C. Greubel, Oct 24 2016: (Start)
G.f.: (28*x)/(1 - x)^2.
E.g.f.: 28*x*exp(x).
a(n) = 2*a(n-1) - a(n-2). (End)