1,1
Cf. A000040, A139253, A161206, A161414, A161423.
Sequence in context: A079018 A002383 A163418 this_sequence A068679 A006978 A060424
Adjacent sequences: A161215 A161216 A161217 this_sequence A161219 A161220 A161221
more,nonn
Omar E. Pol (info(AT)polprimos.com), Jun 10 2009
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