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A343176
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a(0)=3; for n > 0, a(n) = 2^(2*n) + 3*2^(n-1) + 1.
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2
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3, 8, 23, 77, 281, 1073, 4193, 16577, 65921, 262913, 1050113, 4197377, 16783361, 67121153, 268460033, 1073790977, 4295065601, 17180065793, 68719869953, 274878693377, 1099513200641, 4398049656833, 17592192335873, 70368756760577, 281475001876481, 1125899957174273, 4503599728033793
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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a(n) = 7*a(n-1) - 14*a(n-2) + 8*a(n-3) for n > 3.
G.f.: -(4*x - 3)*(x^2 + 3*x - 1)/((x - 1)*(2*x - 1)*(4*x - 1)). (End)
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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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