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Search: id:A061545
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OFFSET
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1,2
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COMMENT
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a(5) = 1 since "xrrxrrxrxr" is the shortest only sequence reversing "ABCDE".
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EXAMPLE
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For n = 6 there are 2 possibilities: A048200(6) = 15. -> Two minimal XR-sequences with length 15 exist. -> "xrxrrxrxrrxrrrx" "rxrrxrxrrxrxrrx"; so a(6) = 2.
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CROSSREFS
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Cf. A048200.
Sequence in context: A025177 A026148 A117211 this_sequence A126886 A165680 A105685
Adjacent sequences: A061542 A061543 A061544 this_sequence A061546 A061547 A061548
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KEYWORD
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more,nonn
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AUTHOR
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Naohiro Nomoto (6284968128(AT)geocities.co.jp), May 16 2001
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