1,5
Cf. A000843.
Sequence in context: A045633 A090826 A132441 this_sequence A039809 A002838 A076822
Adjacent sequences: A000837 A000838 A000839 this_sequence A000841 A000842 A000843
nonn
Brendan McKay and Eric Rogoyski, bdm(AT)cs.anu.edu.au
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