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A344919
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a(n) = n^n - n*(n + 1) / 2.
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1
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1, 0, 1, 21, 246, 3110, 46635, 823515, 16777180, 387420444, 9999999945, 285311670545, 8916100448178, 302875106592162, 11112006825557911, 437893890380859255, 18446744073709551480, 827240261886336764024, 39346408075296537575253, 1978419655660313589123789, 104857599999999999999999790
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OFFSET
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0,4
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LINKS
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FORMULA
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a(n) = Product_{j=1..n} n - Sum_{j=1..n} j.
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PROG
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(Python)
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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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