0,4
Cf. A000045, A004170.
Sequence in context: A155881 A041731 A041331 this_sequence A072210 A014258 A059359
Adjacent sequences: A004088 A004089 A004090 this_sequence A004092 A004093 A004094
nonn,base
N. J. A. Sloane (njas(AT)research.att.com).
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