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A247055
as a simple table
n
a(n)
0
1
1
1
2
3
3
12
4
73
5
580
6
5601
7
63994
8
844929
9
12647016
10
211616785
[1,1,3,12,73,580,5601,63994,844929,12647016, 211616785]