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A054859
as a simple table
n
a(n)
0
1
1
2
2
5
3
41
4
1151
5
311
6
34421
7
218918
8
3634531
9
48205429
10
1798467197
11
12941709050
12
166400805323
13
6123584726269
[1,2,5,41,1151,311,34421,218918,3634531,48205429, 1798467197,12941709050,166400805323,6123584726269]