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A144465
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a(n) = 5^n - 2^(n - 1) for n > 0; a(0) = 1.
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0
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1, 4, 23, 121, 617, 3109, 15593, 78061, 390497, 1952869, 9765113, 48827101, 244138577, 1220699029, 6103507433, 30517561741, 152587857857, 762939387589, 3814697134553, 19073486065981, 95367431116337
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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) = 7*a(n-1)-10*a(n-2), n > 3.
G.f.: (1-3*x+5*x^2)/((1-5*x)*(1-2*x)). [corrected by Vaclav Kotesovec, May 16 2021] (End)
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MATHEMATICA
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Table[If [n == 0, 1, 5^n - 2^(n - 1)], {n, 0, 20}]
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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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