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A322495
as a simple table
n
a(n)
0
1
1
1
2
2
3
8
4
68
5
1262
6
51420
7
4577274
8
888837716
9
376116199534
10
346688563051200
11
695975307003529228
[1,1,2,8,68,1262,51420,4577274,888837716, 376116199534,346688563051200,695975307003529228]