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A016874
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a(n) = (5*n + 2)^2.
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2
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4, 49, 144, 289, 484, 729, 1024, 1369, 1764, 2209, 2704, 3249, 3844, 4489, 5184, 5929, 6724, 7569, 8464, 9409, 10404, 11449, 12544, 13689, 14884, 16129, 17424, 18769, 20164, 21609, 23104, 24649, 26244
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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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Sum_{n>=0} 1/a(n) = polygamma(1, 2/5)/25. - Amiram Eldar, Oct 02 2020
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EXAMPLE
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a(0) = (5*0 + 2)^2 = 4.
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MATHEMATICA
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PROG
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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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