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A354307
as a simple table
n
a(n)
1
2
2
10
3
70
4
550
5
4590
6
39774
7
353860
8
3210940
9
29581000
10
275808700
11
2596707296
[2,10,70,550,4590,39774,353860,3210940,29581000, 275808700,2596707296]