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A331947
as a simple table
n
a(n)
1
2
2
12
3
20
4
68
5
90
6
98
7
132
8
252
9
318
10
362
11
398
12
1722
13
259668
14
315180
15
452042
[2,12,20,68,90,98,132,252,318,362,398,1722,259668, 315180,452042]