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A099715
as a simple table
n
a(n)
0
1
1
1
2
8
3
113
4
2374
5
67927
6
2508632
7
115219211
8
6402538044
9
42137859873
10
32293353537408
11
2842256451820073
[1,1,8,113,2374,67927,2508632,115219211, 6402538044,42137859873,32293353537408, 2842256451820073]