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A152621 a(n)=8*a(n-1)-6*a(n-2), n>1 ; a(0)=1, a(1)=2. 0
1, 2, 10, 68, 484, 3464, 24808, 177680, 1272592, 9114656, 65281696, 467565632, 3348834880, 23985285248, 171789272704, 1230402470144, 8812484124928, 63117458178560, 452064760678912, 3237813336359936, 23190118126806016 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Unsigned version of A152620.

LINKS

Table of n, a(n) for n=0..20.

Index entries for linear recurrences with constant coefficients, signature (8,-6)

FORMULA

G.f.: (1-6*x)/(1-8*x+6*x^2).

a(n)=(1/2)*{[4-sqrt(10)]^n+[4+sqrt(10)]^n}+(1/10)*sqrt(10)*{[4-sqrt(10)]^n-[4+sqrt(10)]^n}, with n>=0 [From Paolo P. Lava, Dec 12 2008]

CROSSREFS

Sequence in context: A049036 A208561 A152620 * A147725 A074603 A110520

Adjacent sequences:  A152618 A152619 A152620 * A152622 A152623 A152624

KEYWORD

nonn,easy

AUTHOR

Philippe Deléham, Dec 10 2008

STATUS

approved

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Last modified September 26 15:27 EDT 2017. Contains 292531 sequences.