0,1
Cf. A000720, A099802.
Sequence in context: A081599 A137180 A128635 this_sequence A081063 A081304 A137721
Adjacent sequences: A100634 A100635 A100636 this_sequence A100638 A100639 A100640
easy,nonn
Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 04 2004
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