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A032222 formatted as a simple table:

n a(n)
1 2
2 4
3 14
4 48
5 162
6 1186
7 6918
8 39696
9 537170
10 3056574
11 25758438
12 355775778
13 3541870438
14 26985605042
15 248862069474
16 6053773511696
17 46393386523698
18 511397173220686
19 4891387087110678
20 118913797103152638

[2,4,14,48,162,1186,6918,39696,537170,3056574,
 25758438,355775778,3541870438,26985605042,
 248862069474,6053773511696,46393386523698,
 511397173220686,4891387087110678,
 118913797103152638]

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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