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A091315
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Number of orbits of length n under the map whose periodic points are counted by A061684.
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0
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1, 2, 21, 402, 13805, 761154, 62523664, 7237970648, 1132600004910, 231900134422880, 60528794385067778, 19713593779259862624, 7869483395065035685162, 3792402572391137423764584
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OFFSET
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1,2
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COMMENTS
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Old name was: A061684 appears to count the periodic points for a certain map. If so, then this is the sequence of the numbers of orbits of length n.
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LINKS
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FORMULA
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If b(n) is the (n+1)th term in A061684, then a(n) = (1/n)*Sum_{d|n}mu(d)b(n/d).
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EXAMPLE
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The sequence A061684 begins 1,1,5,64,1613, so a(3)=(b(3)-b(1))/3=21.
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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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