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A017239
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a(n) = (9*n + 6)^7.
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1
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279936, 170859375, 4586471424, 42618442977, 230539333248, 897410677851, 2799360000000, 7446353252589, 17565568854912, 37725479487783, 75144747810816, 140710042265625, 250226879128704, 425927596977747
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OFFSET
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0,1
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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)=279936, a(1)=170859375, a(2)=4586471424, a(3)=42618442977, a(4)=230539333248, a(5)=897410677851, a(6)=2799360000000, a(7)=7446353252589. - Harvey P. Dale, Feb 11 2015
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MATHEMATICA
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(9*Range[0, 20]+6)^7 (* or *) LinearRecurrence[{8, -28, 56, -70, 56, -28, 8, -1}, {279936, 170859375, 4586471424, 42618442977, 230539333248, 897410677851, 2799360000000, 7446353252589}, 20] (* Harvey P. Dale, Feb 11 2015 *)
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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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