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A169588
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The total number of ways of partitioning the multiset {1,1,1,1,2,3,...,n-3}.
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5
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5, 12, 38, 141, 592, 2752, 13960, 76464, 448603, 2801054, 18516832, 129034659, 944356507, 7235605732, 57879020756, 482189616711, 4174720731316, 37489711726834, 348592657600818, 3350919079643612, 33252861484374737, 340209759518479300, 3584240435109146792
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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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For n>=4, a(n)=(Bell(n)+6Bell(n-1)+17Bell(n-2)+20Bell(n-3)+21Bell(n-4))/24, where Bell(n) is the n-th Bell number (the Bell numbers are given in A000110). e.g.f. (e^(4x)+12e^(3x)+42e^(2x)+44e^x+21)(e^(e^x-1))/24.
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MATHEMATICA
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Table[(BellB[n] + 6 BellB[n - 1] + 17 BellB[n - 2] + 20 BellB[n - 3] + 21 BellB[n - 4])/24, {n, 4, 23}]
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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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