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A304984
as a simple table
n
a(n)
0
1
1
2
2
7
3
56
4
1533
5
210302
6
496838435
7
309068803876372
8
14369391923126181310256825
[1,2,7,56,1533,210302,496838435,309068803876372, 14369391923126181310256825]