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A024069
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a(n) = 6^n - n^7.
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2
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1, 5, -92, -1971, -15088, -70349, -233280, -543607, -417536, 5294727, 50466176, 343309885, 2140950528, 12997945499, 78258750592, 470014125201, 2820841472000, 16926249106063, 101559344448384, 609358846138757
(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) = 14*a(n-1) - 76*a(n-2) + 224*a(n-3) - 406*a(n-4) + 476*a(n-5) - 364*a(n-6) + 176*a(n-7) - 49*a(n-8) + 6*a(n-9) for n > 8.
G.f.: (-7*x^8 - 711*x^7 - 7054*x^6 - 13249*x^5 - 4800*x^4 + 527*x^3 + 86*x^2 + 9*x - 1)/((x - 1)^8*(6*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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