1,1
Cf. A000594.
Sequence in context: A036988 A108357 A088517 this_sequence A004569 A100060 A147850
Adjacent sequences: A040050 A040051 A040052 this_sequence A040054 A040055 A040056
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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