1,1
Cf. A000043.
Sequence in context: A078763 A157884 A085306 this_sequence A123239 A048891 A068820
Adjacent sequences: A161319 A161320 A161321 this_sequence A161323 A161324 A161325
nonn
Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jun 07 2009
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