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A121123 as a simple table

n a(n)
2 1
3 3
4 12
5 63
6 342
7 1998
8 11772
9 70308
10 420552 

[1,3,12,63,342,1998,11772,70308,420552]

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Last modified June 18 18:23 EDT 2013. Contains 226355 sequences.