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A331687
as a simple table
n
a(n)
1
1
2
2
3
4
4
12
5
29
6
93
7
249
8
803
9
2337
10
7480
11
23130
12
77372
13
247598
14
834507
15
2762222
[1,2,4,12,29,93,249,803,2337,7480,23130,77372, 247598,834507,2762222]