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A020523
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a(n) = 3rd Euler polynomial evaluated at 2^n and multiplied by 4.
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6
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-1, 9, 161, 1665, 14849, 124929, 1024001, 8290305, 66715649, 535298049, 4288675841, 34334572545, 274777243649, 2198620602369, 17590575431681, 140731045904385, 1125874137038849, 9007096175525889, 72057181721067521, 576459103035981825
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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) = 4*8^n - 6*4^n + 1.
a(n) = 13*a(n-1)-44*a(n-2)+32*a(n-3) for n>2. - Colin Barker, May 04 2015
G.f.: -(22*x-1) / ((x-1)*(4*x-1)*(8*x-1)). - Colin Barker, May 04 2015
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MAPLE
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seq(euler(3, 2^i), i=0..24);
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MATHEMATICA
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PROG
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(PARI) Vec(-(22*x-1)/((x-1)*(4*x-1)*(8*x-1)) + O(x^100)) \\ Colin Barker, May 04 2015
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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