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A208811
as a simple table
n
a(n)
1
1
2
4
3
19
4
141
5
1093
6
8924
7
77053
8
692566
9
6345907
10
59150386
11
562643309
12
5397588986
13
52466338007
[1,4,19,141,1093,8924,77053,692566,6345907, 59150386,562643309,5397588986,52466338007]