0,2
Cf. A000041, A000110.
Sequence in context: A002838 A076822 A143657 this_sequence A148284 A148285 A115523
Adjacent sequences: A014323 A014324 A014325 this_sequence A014327 A014328 A014329
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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