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Aug 11, 2011 at 18:03 comment added Marcel Bischoff For such things the "The On-Line Encyclopedia of Integer Sequences" is really handy, it gives this result for your sequence: oeis.org/A004075
Aug 11, 2011 at 7:20 answer added Brendan McKay timeline score: 1
Jul 24, 2011 at 5:36 vote accept Erik
Jul 24, 2011 at 5:32 answer added Gerhard Paseman timeline score: 11
Jul 24, 2011 at 5:23 history asked Erik CC BY-SA 3.0