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A066210
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a(n) = ((2*n)^(2*n+2) - 1)/(4*n^2 - 1).
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1
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1, 5, 273, 47989, 17043521, 10101010101, 8978450801041, 11168991475945493, 18519084246547628289, 39468223580173616639125, 105120401002506265664160401, 342134767379466388778420319285, 1336055317331762879448123353666113
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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Table[((2n)^(2n+2)-1)/(4n^2-1), {n, 0, 20}] (* Harvey P. Dale, Jan 18 2020 *)
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PROG
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(PARI) { for (n=0, 100, write("b066210.txt", n, " ", ((2*n)^(2*n+2)-1)/(4*n^2-1)) ) } \\ Harry J. Smith, Feb 06 2010
(Magma) [((2*n)^(2*n+2) - 1)/(4*n^2 - 1): n in [0..12]]; // Vincenzo Librandi, Jan 19 2020
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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