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A203203
as a simple table
n
a(n)
1
1
2
2
3
11
4
145
5
4950
6
337440
7
52523314
8
18534928813
9
14760206822407
10
26441561136591477
[1,2,11,145,4950,337440,52523314,18534928813, 14760206822407,26441561136591477]