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A111561 formatted as a simple table:

n a(n)
0 0
1 2
2 7
3 44
4 354
5 3328
6 35144
7 407984
8 5137824
9 69566144
10 1006372864
11 15481560064
12 252326173824
13 4344015683584
14 78793242566144
15 1502374856981504
16 30052439647908864
17 629485600310349824
18 13783057303819485184

[0,2,7,44,354,3328,35144,407984,5137824,69566144,
 1006372864,15481560064,252326173824,4344015683584,
 78793242566144,1502374856981504,30052439647908864,
 629485600310349824,13783057303819485184]

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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