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A024041
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a(n) = 4^n - n^5.
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2
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1, 3, -16, -179, -768, -2101, -3680, -423, 32768, 203095, 948576, 4033253, 16528384, 66737571, 267897632, 1072982449, 4293918720, 17178449327, 68717587168, 274875430845, 1099508427776
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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) = 10*a(n-1) - 39*a(n-2) + 80*a(n-3) - 95*a(n-4) + 66*a(n-5) - 25*a(n-6) + 4*a(n-7) for n > 6.
G.f.: (-5*x^6 - 97*x^5 - 253*x^4 - 18*x^3 + 7*x^2 + 7*x - 1)/((x - 1)^6*(4*x - 1)). (End)
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MATHEMATICA
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PROG
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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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