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A177818
as a simple table
n
a(n)
1
1
2
19
3
397841
4
1152331
5
3566699
6
24128658809
7
74683110361
8
216316727651
9
1339092172657
10
7967201553697
[1,19,397841,1152331,3566699,24128658809, 74683110361,216316727651,1339092172657, 7967201553697]