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A168302
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The fourth left hand column of triangle A167552
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5
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-8, -66, -264, -689, -1255, -1360, 684, 8502, 28842, 73150, 159588, 315549, 580723, 1010768, 1681640, 2694636, 4182204, 6314574, 9307264, 13429515, 19013709, 26465824, 36276980, 49036130, 65443950, 86327982, 112659084
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OFFSET
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4,1
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LINKS
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FORMULA
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a(n) = (54*n^7 - 1057*n^6 + 7245*n^5 - 24535*n^4 + 45801*n^3 - 47488*n^2 + 25020*n - 5040)/7!.
G.f.: (z^4 + 23*z^3 + 40*z^2 - 2*z - 8)/(z-1)^8.
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(n) - 7*a(n-1) + 21*a(n-2) - 35*a(n-3) + 35*a(n-4) - 21*a(n-5) + 7*a(n-6) - a(n-7) = 2*27.
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MATHEMATICA
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LinearRecurrence[{8, -28, 56, -70, 56, -28, 8, -1}, {-8, -66, -264, -689, -1255, -1360, 684, 8502}, 50] (* G. C. Greubel, Jul 17 2016 *)
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CROSSREFS
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Equals the fourth left hand column of triangle A167552.
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KEYWORD
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easy,sign
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AUTHOR
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STATUS
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approved
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