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A156464
as a simple table
n
a(n)
1
1
2
2
3
2
4
7
5
19
6
1430
7
9131
8
1559914
9
17481322
10
4701559354
11
99812199364
12
42194032310078
[1,2,2,7,19,1430,9131,1559914,17481322,4701559354, 99812199364,42194032310078]