1,1
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Sequence in context: A106634 A063126 A115702 this_sequence A139606 A047717 A089982
Adjacent sequences: A003337 A003338 A003339 this_sequence A003341 A003342 A003343
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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