0,2
Cf. A005151.
Sequence in context: A080070 A080120 A006937 this_sequence A138484 A022506 A127117
Adjacent sequences: A037217 A037218 A037219 this_sequence A037221 A037222 A037223
nonn,base,easy
N. J. A. Sloane (njas(AT)research.att.com).
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