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A135474
as a simple table
n
a(n)
1
1
2
3
3
9
4
36
5
285
6
1908
7
21630
8
197328
9
2113911
10
23814810
11
294557142
12
3893052636
13
55457566905
[1,3,9,36,285,1908,21630,197328,2113911,23814810, 294557142,3893052636,55457566905]