1,1
See A073830 for motivation. Cf. A000142.
Sequence in context: A005381 A099616 A140209 this_sequence A003135 A105742 A105834
Adjacent sequences: A073826 A073827 A073828 this_sequence A073830 A073831 A073832
nonn
Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 12 2002
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