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A147934 formatted as a simple table:

n a(n)
1 1
2 2
3 6
4 24
5 74
6 312
7 1620
8 7876
9 41114
10 262142
11 1640026
12 10906856
13 84761678
14 627751836
15 5070873342
16 46757075664 

[1,2,6,24,74,312,1620,7876,41114,262142,1640026,
 10906856,84761678,627751836,5070873342,
 46757075664]

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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