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A186803
as a simple table
n
a(n)
1
15016660
2
3147544633
3
675297305236
4
144968185692408
5
31102381776833744
6
6674101867860962707
[15016660,3147544633,675297305236,144968185692408, 31102381776833744,6674101867860962707]