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A331837
as a simple table
n
a(n)
1
1
2
6
3
126
4
198
5
1433322
6
317533782
7
386625738
8
451240398
9
394171702494
10
701463692694
11
2111238978018
[1,6,126,198,1433322,317533782,386625738, 451240398,394171702494,701463692694,2111238978018]