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A208943
as a simple table
n
a(n)
1
1
2
7
3
42
4
366
5
3376
6
33468
7
344456
8
3656654
9
39711890
10
439202182
11
4929418548
12
56004017042
13
642825693604
[1,7,42,366,3376,33468,344456,3656654,39711890, 439202182,4929418548,56004017042,642825693604]