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A027209 formatted as a simple table:

n a(n)
2 1
3 7
4 34
5 173
6 741
7 3549
8 14670
9 68683
10 279715
11 1294598
12 5233060
13 24052965
14 96822587
15 442972139
16 1778697948
17 8110611295
18 32516501991
19 147897243768
20 592346459071

[1,7,34,173,741,3549,14670,68683,279715,1294598,
 5233060,24052965,96822587,442972139,1778697948,
 8110611295,32516501991,147897243768,592346459071]

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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