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A001206 as a simple table

n a(n)
0 0
1 1
2 2
3 4
4 12
5 81
6 2646
7 1422564
8 229809982112
9 423295099074735261880 

[0,1,2,4,12,81,2646,1422564,229809982112,
 423295099074735261880]

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Last modified May 19 23:29 EDT 2013. Contains 225436 sequences.