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A219767
as a simple table
n
a(n)
1
2
2
4
3
14
4
100
5
1229
6
27921
7
1163030
8
98763027
9
18231769222
10
7304376778802
[2,4,14,100,1229,27921,1163030,98763027, 18231769222,7304376778802]