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A017167
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a(n) = (9*n)^7.
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1
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0, 4782969, 612220032, 10460353203, 78364164096, 373669453125, 1338925209984, 3938980639167, 10030613004288, 22876792454961, 47829690000000, 93206534790699, 171382426877952, 300124211606973
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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) = 8*a(n-1) - 28*a(n-2) + 56*a(n-3) - 70*a(n-4) + 56*a(n-5) - 28*a(n-6) + 8*a(n-7) - a(n-8); a(0)=0, a(1)=4782969, a(2)=612220032, a(3)=10460353203, a(4)=78364164096, a(5)=373669453125, a(6)=1338925209984, a(7)=3938980639167. - Harvey P. Dale, Feb 21 2014
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MATHEMATICA
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(9*Range[0, 20])^7 (* or *) LinearRecurrence[{8, -28, 56, -70, 56, -28, 8, -1}, {0, 4782969, 612220032, 10460353203, 78364164096, 373669453125, 1338925209984, 3938980639167}, 20] (* Harvey P. Dale, Feb 21 2014 *)
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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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