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A197926
as a simple table
n
a(n)
1
1
2
2
3
4
4
10
5
18
6
142
7
202
8
282
9
528
10
812
11
1240
12
1280
13
1372
14
1454
15
1488
16
1666
[1,2,4,10,18,142,202,282,528,812,1240,1280,1372, 1454,1488,1666]