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A220108
as a simple table
n
a(n)
1
56
2
4020
3
252520
4
16187862
5
1028824446
6
65676456950
7
4186526618878
8
266969050965322
[56,4020,252520,16187862,1028824446,65676456950, 4186526618878,266969050965322]