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Old 2021-01-27, 03:41   #3
CRGreathouse
 
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Aug 2006

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I think that's the only pure, nontrivial alternating sequence in the OEIS at the moment. There are A062157, A105812, A117154, A165326, and A280560 which alternate after some finite prefix, and of course A000004 which alternates in a trivial sort of way.
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