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A006570 formatted as a simple table:

n a(n)
1 1
2 2
3 5
4 15
5 48
6 166
7 596
8 2221
9 8472

[1,2,5,15,48,166,596,2221,8472]

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.


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