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A024080
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a(n) = 7^n - n^5.
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2
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1, 6, 17, 100, 1377, 13682, 109873, 806736, 5732033, 40294558, 282375249, 1977165692, 13841038369, 96888639114, 678222535025, 4747560750568, 33232929521025, 232630512567350, 1628413596020881, 11398895182897044
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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) = 13*a(n-1) - 57*a(n-2) + 125*a(n-3) - 155*a(n-4) + 111*a(n-5) - 43*a(n-6) + 7*a(n-7) for n > 6.
G.f.: (-8*x^6 - 175*x^5 - 451*x^4 - 96*x^3 + 4*x^2 + 7*x - 1)/((x - 1)^6*(7*x - 1)). (End)
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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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