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A177638
as a simple table
n
a(n)
1
1
2
70
3
25446
4
29416791
5
83400344760
6
492319974701196
7
5405431813676888595
8
101632942861784833336188
[1,70,25446,29416791,83400344760,492319974701196, 5405431813676888595,101632942861784833336188]