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A342405
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a(n) = (27^n - 3*9^n - 3*12^n)/6 + 6^n.
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1
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0, 45, 2268, 76221, 2245320, 62858025, 1723364748, 46836754821, 1268169391440, 34282547074305, 926123262507828, 25011175461289821, 675371104361586360, 18235844869321055385, 492377645105637260508, 13294313813660319607221, 358947876218708733778080
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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) = 54*a(n-1) - 963*a(n-2) + 6966*a(n-3) - 17496*a(n-4) for n > 4.
G.f.: 9*x^2*(-324*x^2 - 18*x + 5)/((6*x - 1)*(9*x - 1)*(12*x - 1)*(27*x - 1)). (End)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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