1,4
See A000162.
Sequence in context: A088855 A034851 A122085 this_sequence A059260 A135229 A081372
Adjacent sequences: A066284 A066285 A066286 this_sequence A066288 A066289 A066290
nonn
Brendan Owen (brendan_owen(AT)yahoo.com), Jan 01 2002
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