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A323824
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a(0) = 6; thereafter a(n) = 4*a(n-1) + 1.
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2
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6, 25, 101, 405, 1621, 6485, 25941, 103765, 415061, 1660245, 6640981, 26563925, 106255701, 425022805, 1700091221, 6800364885, 27201459541, 108805838165, 435223352661, 1740893410645, 6963573642581, 27854294570325, 111417178281301, 445668713125205
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OFFSET
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0,1
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LINKS
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FORMULA
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G.f.: (6 - 5*x) / ((1 - x)*(1 - 4*x)).
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MATHEMATICA
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LinearRecurrence[{5, -4}, {6, 25}, 30] (* Paolo Xausa, Nov 14 2023 *)
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PROG
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(PARI) Vec((6 - 5*x) / ((1 - x)*(1 - 4*x)) + O(x^25)) \\ Colin Barker, Feb 01 2019
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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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STATUS
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approved
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