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A165229 a(0)=1, a(1)=6, a(n)=12*a(n-1)-6*a(n-2) for n>1 . 1
1, 6, 66, 756, 8676, 99576, 1142856, 13116816, 150544656, 1727834976, 19830751776 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..10.

Index entries for linear recurrences with constant coefficients, signature (12,-6).

FORMULA

G.f.: (1-6x)/(1-12x+6x^2) .

a(n)=(1/2)*{[6+sqrt(30)]^n+[6-sqrt(30)]^n , with n>=0 [From Paolo P. Lava, Sep 16 2009]

CROSSREFS

Sequence in context: A022024 A186666 A129554 * A247740 A253621 A127857

Adjacent sequences:  A165226 A165227 A165228 * A165230 A165231 A165232

KEYWORD

nonn,easy

AUTHOR

Philippe Deléham, Sep 09 2009

STATUS

approved

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Last modified April 10 02:39 EDT 2020. Contains 333392 sequences. (Running on oeis4.)