1,2
Cf. A018856.
Sequence in context: A004072 A113030 A030001 this_sequence A004842 A022378 A103028
Adjacent sequences: A018799 A018800 A018801 this_sequence A018803 A018804 A018805
nonn,base
David W. Wilson (davidwwilson(AT)comcast.net)
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