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A123770
as a simple table
n
a(n)
1
1
2
8
3
152
4
3594
5
96105
6
2734356
7
81126946
8
2480378897
9
77597683206
10
2472038270424
[1,8,152,3594,96105,2734356,81126946,2480378897, 77597683206,2472038270424]