0,1
Eric Weisstein's World of Mathematics, Source
Cf. A053686, A000101, A002386, A005250.
Sequence in context: A126615 A158524 A054274 this_sequence A119918 A084867 A099259
Adjacent sequences: A053692 A053693 A053694 this_sequence A053696 A053697 A053698
nonn
Jeff Burch (gburch(AT)erols.com), Mar 23 2000
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