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A280468
as a simple table
n
a(n)
1
4
2
16
3
187
4
245
5
1326
6
22025
7
217076
8
2214752
9
25047853
10
282144055
11
694855331
[4,16,187,245,1326,22025,217076,2214752,25047853, 282144055,694855331]