0,2
Cf. A000045, A003849.
Sequence in context: A120892 A109655 A001120 this_sequence A024419 A094448 A063805
Adjacent sequences: A117719 A117720 A117721 this_sequence A117723 A117724 A117725
easy,nonn
E.J.Vening (permutate(AT)gmail.com), Apr 13 2006
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 21 2008
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