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A201444
as a simple table
n
a(n)
1
4
2
2
3
52
4
112
5
4544
6
16334
7
1129682
8
5464208
9
458459214
10
2605975384
11
253569083138
12
1617730690396
[4,2,52,112,4544,16334,1129682,5464208,458459214, 2605975384,253569083138,1617730690396]