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A122885
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a(n+1) = 4*a(n) + 11*a(n-1) - 2*a(n-2).
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3
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1, 13, 61, 385, 2185, 12853, 74677, 435721, 2538625, 14798077, 86245741, 502684561, 2929845241, 17076419653, 99528607141, 580095354265, 3381043256305, 19706164707853, 114855943942237, 669429501042721
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n+1) = 4*a(n) + 11*a(n-1) - 2*a(n-2).
G.f.: x*(1+9*x-2*x^2)/((2*x+1)*(1-6*x+x^2)). - R. J. Mathar, Aug 12 2009
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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