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A135628
Multiples of 28.
10
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
0,2
LINKS
Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081 [math.CO], 2014.
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)
EXAMPLE
a(9) = 28*9 = 252.
MATHEMATICA
Range[0, 3000, 28] (* Vladimir Joseph Stephan Orlovsky, Jun 03 2011 *)
LinearRecurrence[{2, -1}, {0, 28}, 25] (* G. C. Greubel, Oct 24 2016 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Nov 25 2007
STATUS
approved