OFFSET
0,2
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)
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