1,3
Cf. A001223.
Sequence in context: A107775 A003117 A138229 this_sequence A029661 A133856 A018853
Adjacent sequences: A131699 A131700 A131701 this_sequence A131703 A131704 A131705
nonn
Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Sep 16 2007
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