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Search: id:A163949
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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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+0
2
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OFFSET
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1,2
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COMMENT
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It is similar to A163947, but the difference is expressed by the non trivial sequence: 0, 3, 9, 54, 320, 1590, 6552... excluding solutions by powers of the function itself.
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CROSSREFS
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Cf. A163947, A163950.
Sequence in context: A028362 A113723 A113379 this_sequence A005816 A086228 A162078
Adjacent sequences: A163946 A163947 A163948 this_sequence A163950 A163951 A163952
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KEYWORD
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more,nonn
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AUTHOR
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Carlos Alves (cjsalves(AT)gmail.com), Aug 06 2009
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