1,3
Cf. A000043, A000668, A124477.
Adjacent sequences: A139476 A139477 A139478 this_sequence A139480 A139481 A139482
Sequence in context: A043106 A036133 A062671 this_sequence A078569 A044082 A045576
nonn
Artur Jasinski (grafix(AT)csl.pl), Apr 22 2008
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