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A343175
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a(0)=2; for n > 0, a(n) = 2^(2*n-1) + 2^n + 1.
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3
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2, 5, 13, 41, 145, 545, 2113, 8321, 33025, 131585, 525313, 2099201, 8392705, 33562625, 134234113, 536903681, 2147549185, 8590065665, 34360000513, 137439477761, 549756862465, 2199025352705, 8796097216513, 35184380477441, 140737505132545, 562949986975745, 2251799880794113
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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 - 6*x^2 + 9*x - 2)/((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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