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A163949
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The number of functions in a finite set that are not obtainable by a composition power of any other function. Similar to A163947, but it excludes self compositions.
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1
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OFFSET
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1,2
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COMMENTS
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It is similar to A163947, but the difference is expressed by the nontrivial sequence: 0, 3, 9, 54, 320, 1590, 6552... excluding solutions by powers of the function itself.
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LINKS
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FORMULA
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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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STATUS
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approved
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