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A196315
as a simple table
n
a(n)
1
1
2
7
3
30
4
495
5
17093
6
1313940
7
228181579
8
88027683663
9
75477277195192
10
143743832507166333
[1,7,30,495,17093,1313940,228181579,88027683663, 75477277195192,143743832507166333]