From von Staudt-Clausen representation of Bernoulli numbers: a(n) = Bernoulli(2n) + Sum_{(p-1)|2n} 1/p.
1, 1, 1, 1, 1, 1, 2, 6, 56, 528, 6193, 86579, 1425518, 27298230, 601580875
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Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java