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A252285
as a simple table
n
a(n)
1
564
2
1920
3
8208
4
68320
5
1227461
6
41069194
7
2178722578
8
178658210404
9
22705656001038
10
4445145404367921
[564,1920,8208,68320,1227461,41069194,2178722578, 178658210404,22705656001038,4445145404367921]