1,1
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Sequence in context: A042639 A063240 A063157 this_sequence A161447 A047718 A031053
Adjacent sequences: A003338 A003339 A003340 this_sequence A003342 A003343 A003344
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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