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A163860
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Number of different 4th-power (quartic) mappings of a finite set of n elements into itself.
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4
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1, 1, 3, 12, 73, 580, 5721, 69244, 1000210, 16319601, 297453340
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OFFSET
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0,3
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COMMENTS
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The same as A102687 for square composition, as A163859 for cubic compositions, here a(n) is the number of different mappings g that admit at least one mapping f as the 4th-order root (g=fofofof) in terms of the composition.
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LINKS
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CROSSREFS
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KEYWORD
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more,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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