1,1
Essentially the same as A007521.
Sequence in context: A122491 A002559 A049097 this_sequence A158708 A093702 A011756
Adjacent sequences: A045363 A045364 A045365 this_sequence A045367 A045368 A045369
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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