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A281595
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a(n) = (n^n - 3*(n-1)^n + 3*(n-2)^n - (n-3)^n)/6.
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3
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0, 0, 0, 1, 10, 125, 1890, 33621, 688506, 15958405, 413066170, 11810819141, 369730963602, 12577271147805, 461980538087250, 18223376862518101, 768327068469302218, 34480595937671194805, 1641060381277816308810, 82562177153973368528901, 4378026144983797903473954
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OFFSET
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0,5
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LINKS
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MAPLE
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a := n -> (n^n-3*(n-1)^n+3*(n-2)^n-(n-3)^n)/6:
seq(a(n), n=0..20);
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MATHEMATICA
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A281595[n_] := If[n == 0, 0, (n^n - 3*(n-1)^n + 3*(n-2)^n - (n-3)^n)/6];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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