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A195857
a(n) = T(9, n), array T given by A047858.
1
1, 11, 32, 76, 168, 360, 760, 1592, 3320, 6904, 14328, 29688, 61432, 126968, 262136, 540664, 1114104, 2293752, 4718584, 9699320, 19922936, 40894456, 83886072, 171966456, 352321528, 721420280, 1476395000, 3019898872, 6174015480, 12616466424, 25769803768
OFFSET
0,2
FORMULA
a(n) = 2^(n-1)*(n+18)-8.
a(0)=1, a(1)=11, a(2)=32, a(n) = 5*a(n-1)-8*a(n-2)+4*a(n-3).
G.f.: (1+6*x-15*x^2) / ((1-x)*(1-2*x)^2). - Colin Barker, Aug 24 2016
PROG
(Magma) [2^(n-1)*(n+18)-8: n in [0..30]]
(PARI) Vec((1+6*x-15*x^2)/((1-x)*(1-2*x)^2) + O(x^40)) \\ Colin Barker, Aug 24 2016
CROSSREFS
Sequence in context: A059134 A215727 A007790 * A048773 A056123 A006655
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Sep 28 2011
STATUS
approved