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Search: id:A028025
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| A028025 |
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Expansion of 1/((1-3x)(1-4x)(1-5x)(1-6x)). |
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+0
3
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| 1, 18, 205, 1890, 15421, 116298, 830845, 5709330, 38119741, 249026778, 1599719485, 10142356770, 63639854461, 396031348458, 2448208592125, 15053605980210, 92160458747581, 562225198873338, 3419937140824765
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OFFSET
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0,2
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FORMULA
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If we define f(m,j,x)=sum(binomial(m,k)*stirling2(k,j)*x^(m-k),k=j..m) then a(n-3)=f(n,3,3), (n>=3). [From Milan R. Janjic (agnus(AT)blic.net), Apr 26 2009]
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CROSSREFS
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Sequence in context: A086573 A097515 A026881 this_sequence A109126 A022742 A055528
Adjacent sequences: A028022 A028023 A028024 this_sequence A028026 A028027 A028028
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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