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A329969
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a(n) = Sum_{k=1..n} Stirling2(n,k) * gcd(n,k).
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0
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1, 3, 7, 25, 56, 484, 883, 9643, 32497, 344277, 678580, 13364806, 27644449, 582379763, 3257283507, 28924878925, 82864869820, 2320283069804, 5832742205075, 159175049844787, 1283043441049111, 10423261367890565, 44152005855084368, 1678303577387465300, 9478188244330160181
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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a[n_] := Sum[StirlingS2[n, k] GCD[n, k], {k, 1, n}]; Table[a[n], {n, 1, 25}]
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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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