0,2
Cf. A000108, A000110.
Sequence in context: A006789 A098569 A137549 this_sequence A137550 A047970 A137551
Adjacent sequences: A014324 A014325 A014326 this_sequence A014328 A014329 A014330
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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