1,1
Cf. A002061
Sequence in context: A119017 A002667 A145675 this_sequence A093183 A125520 A163131
Adjacent sequences: A162598 A162599 A162600 this_sequence A162602 A162603 A162604
easy,nonn
Daniel Tisdale (daniel6874(AT)gmail.com), Jul 07 2009
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