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A010035
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a(n) = 2*3^(2*n)-3^n.
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3
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1, 15, 153, 1431, 13041, 117855, 1062153, 9563751, 86086881, 774821295, 6973509753, 62761942071, 564858541521, 5083730062335, 45753580126953, 411782249840391, 3706040334656961, 33354363270192975, 300189270206577753, 2701703434183722711, 24315330914627073201
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 12*a(n-1)-27*a(n-2). G.f.: (3*x+1) / ((3*x-1)*(9*x-1)). - Colin Barker, Oct 01 2014
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MAPLE
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f := n->2*3^(2*n)-3^n;
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PROG
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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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Steve King (ITTTUCSON(AT)aol.com)
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EXTENSIONS
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More terms, and corrections to name, Maple and prog to agree with the offset, from Colin Barker, Oct 01 2014
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STATUS
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approved
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