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A055861
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Essentially A053506 but with leading 0 (instead of 1) and offset 0.
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2
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0, 0, 6, 48, 500, 6480, 100842, 1835008, 38263752, 900000000, 23579476910, 681091006464, 21505924728444, 737020860878848, 27246730957031250, 1080863910568919040, 45798768824157052688, 2064472028642102280192
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history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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FORMULA
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a(0) = 0 = a(1); a(n) = n*(n+1)^(n-1), n >= 2.
E.g.f.: -x + W(-x)^2/((1+W(-x))*x) = ((d/dx)W(-x)^2)/2-x, W(x) principal branch of Lambert's function.
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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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