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A094639 as a simple table

n a(n)
0 1
1 2
2 6
3 31
4 227
5 1991
6 19415
7 203456
8 2248356
9 25887400
10 307993016
11 3763786812
12 47032778956
13 598933188956
14 7751562502556
15 101741582076581
16 1351906409905481
17 18159677984049581
18 246298405721739581

[1,2,6,31,227,1991,19415,203456,2248356,25887400,
 307993016,3763786812,47032778956,598933188956,
 7751562502556,101741582076581,1351906409905481,
 18159677984049581,246298405721739581]

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Last modified February 23 15:31 EST 2018. Contains 299581 sequences. (Running on oeis4.)