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A051405
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(3^n+1)*(3^(n+1)+1)/4.
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0
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2, 10, 70, 574, 5002, 44530, 399310, 3589414, 32291602, 290585050, 2615147350, 23535971854, 211822683802, 1906400965570, 17157599124190, 154418363419894, 1389765184685602, 12507886403890090, 112570976860169830, 1013138789417005534
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..19.
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FORMULA
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a(0)=2, a(1)=10, a(2)=70, a(n)=13*a(n-1)-39*a(n-2)+27*a(n-3) From Harvey P. Dale, Jul 13 2012
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MATHEMATICA
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Table[(3^n+1)(3^(n+1)+1)/4, {n, 0, 20}] (* or *) LinearRecurrence[{13, -39, 27}, {2, 10, 70}, 20] (* Harvey P. Dale, Jul 13 2012 *)
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CROSSREFS
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Sequence in context: A121201 A166076 A217938 * A005568 A036075 A212914
Adjacent sequences: A051402 A051403 A051404 * A051406 A051407 A051408
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KEYWORD
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nonn
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AUTHOR
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Colin Mallows
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STATUS
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approved
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