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A038061
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a(n) = 3^n*n^(n-1).
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2
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3, 18, 243, 5184, 151875, 5668704, 257298363, 13759414272, 847288609443, 59049000000000, 4594736955793347, 394865111526801408, 37144672966729275363, 3796313155316599873536, 418886580596209716796875
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listen;
history;
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internal format)
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OFFSET
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1,1
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COMMENTS
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Labeled rooted trees with 3-colored nodes.
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LINKS
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FORMULA
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E.g.f. B(3x) where B(x) is e.g.f. of A000169.
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MAPLE
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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