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A195970
as a simple table
n
a(n)
1
1
2
9
3
24
4
67
5
244
6
1280
7
5637
8
32909
9
212185
10
1609756
11
13476199
12
134461394
[1,9,24,67,244,1280,5637,32909,212185,1609756, 13476199,134461394]