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A020541
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a(n) = 4th Chebyshev polynomial (second kind) evaluated at 2^n.
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1
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5, 209, 3905, 64769, 1045505, 16764929, 268386305, 4294770689, 68718690305, 1099508482049, 17592173461505, 281474926379009, 4503599426043905, 72057593232621569, 1152921501385621505, 18446744060824649729, 295147905127813218305, 4722366482663486783489
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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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a(n) = 16^(n+1) - 3*4^(n+1) + 1.
a(n) = 21*a(n-1) - 84*a(n-2) + 64*a(n-3) for n>2. -Colin Barker,May 03 2015
G.f.: (64*x^2-104*x-5) / ((x-1)*(4*x-1)*(16*x-1)). -Colin Barker,May 03 2015
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MAPLE
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with(orthopoly):seq(U(4, 2^i), i=0..24);
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MATHEMATICA
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PROG
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(PARI) Vec((64*x^2-104*x-5)/((x-1)*(4*x-1)*(16*x-1)) + O(x^100)) \\Colin Barker,May 03 2015
(PARI) a(n) = polchebyshev(4, 2, 2^n) \\Michel Marcus,May 03 2015
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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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