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A109760
as a simple table
n
a(n)
1
4
2
365
3
400
4
685
5
3200
6
6400
7
12550
8
12800
9
16525
10
25600
11
51200
12
225125
13
70463125
14
271094125
15
431434441
[4,365,400,685,3200,6400,12550,12800,16525,25600, 51200,225125,70463125,271094125,431434441]