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A024052
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a(n) = 5^n - n^3.
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2
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1, 4, 17, 98, 561, 3000, 15409, 77782, 390113, 1952396, 9764625, 48826794, 244138897, 1220700928, 6103512881, 30517574750, 152587886529, 762939448212, 3814697259793, 19073486321266, 95367431632625
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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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G.f.: (1 - 5*x + 7*x^2 + 15*x^3 + 6*x^4)/((1-5*x)*(1-x)^4). - Maksym Voznyy (voznyy(AT)mail.ru), Aug 13 2009
a(n) = 9*a(n-1) - 26*a(n-2) + 34*a(n-3) - 21*a(n-4) + 5*a(n-5).
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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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