1,3
Cf. A001405.
Adjacent sequences: A123537 A123538 A123539 this_sequence A123541 A123542 A123543
Sequence in context: A143264 A126332 A039026 this_sequence A065313 A103566 A018825
nonn
Roger Bagula (rlbagulatftn(AT)yahoo.com), Nov 11 2006
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