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A083328
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a(n) = (6^n - 5^n + 4^n - 3^n)/2.
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1
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0, 1, 9, 64, 423, 2716, 17199, 108004, 673983, 4183516, 25845039, 158993044, 974443743, 5952752716, 36262150479, 220363399684, 1336386968703, 8090385360316, 48906795729519, 295279984663924, 1780943516632863
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OFFSET
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0,3
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COMMENTS
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LINKS
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FORMULA
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G.f.: x(1-9x+21x^2)/((1-3x)(1-4x)(1-5x)(1-6x)).
E.g.f.: exp(6x) - exp(5x) + exp(4x) - exp(3x).
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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