0,3
Cf. A000108.
Sequence in context: A056755 A123617 A139715 this_sequence A121201 A166076 A051405
Adjacent sequences: A051572 A051573 A051574 this_sequence A051576 A051577 A051578
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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