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A324919
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a(n) is the number of I^n-symmetric chains that are not I^k-symmetric for any k dividing n.
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0
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2, 2, 12, 28, 80, 180, 476, 1120, 2772, 6640, 16236, 38976
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OFFSET
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1,1
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COMMENTS
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a(1)-a(12) are the terms of sequence b_n given in row 2 of table I. in Hermisson, Richard, Baake, 1997.
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LINKS
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CROSSREFS
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Cf. A129744 (sequence a_n in the paper).
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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