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A074582
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a(n)=S(3n), where S(n) is the generalized tribonacci sequence A001644.
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0
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3, 7, 39, 241, 1499, 9327, 58035, 361109, 2246915, 13980895, 86992799, 541292033, 3368061131, 20956960551, 130399710235, 811381230021, 5048627019523, 31413882696791, 195465425009943, 1216237188605169, 7567747077883259
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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..20.
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FORMULA
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a(n)=7a(n-1)-5a(n-2)+a(n-3), a(0)=3, a(1)=7, a(2)=39. G.f.: (3-14x+5x^2)/(1-7x+5x^2-x^3).
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MATHEMATICA
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CoefficientList[Series[(3-14*x+5*x^2)/(1-7*x+5*x^2-x^3), {x, 0, 40}], x]
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CROSSREFS
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Cf. A001644, A074581.
Sequence in context: A056250 A113870 A209326 * A105621 A181081 A166895
Adjacent sequences: A074579 A074580 A074581 * A074583 A074584 A074585
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KEYWORD
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easy,nonn
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Aug 24 2002
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STATUS
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approved
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