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A155132 a(n)=8*a(n-1)+8*a(n-2), n>2 ; a(0)=1, a(1)=7, a(2)=63 . 1
1, 7, 63, 560, 4984, 44352, 394688, 3512320, 31256064, 278147072, 2475225088, 22026977280, 196017618944, 1744356769792, 15522995109888, 138138815037440, 1229294481178624, 10939466369728512, 97350086807257088 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

FORMULA

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

a(n)=(35/24)*sqrt(6)*{[4+2*sqrt(6)]^(n-1)-[4-2*sqrt(6)]^(n-1)}+(7/2)*[4+2*sqrt(6)]^(n-1)+[4-2*sqrt(6)]^(n-1)}+(1/8)*[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava, Jan 26 2009]

CROSSREFS

Sequence in context: A218283 A218237 A024088 * A270472 A266426 A233743

Adjacent sequences:  A155129 A155130 A155131 * A155133 A155134 A155135

KEYWORD

nonn

AUTHOR

Philippe Deléham, Jan 20 2009

STATUS

approved

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Last modified December 6 08:53 EST 2016. Contains 278775 sequences.