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A351019
as a simple table
n
a(n)
0
1
1
1
2
5
3
36
4
480
5
9991
6
296913
7
12099604
8
637590728
9
43090005714
10
3550491371994
11
359557627057876
[1,1,5,36,480,9991,296913,12099604,637590728, 43090005714,3550491371994,359557627057876]