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A209006
as a simple table
n
a(n)
1
1
2
2
3
7
4
38
5
243
6
1854
7
14701
8
116960
9
916381
10
7170239
11
56496359
12
449785468
13
3619072169
[1,2,7,38,243,1854,14701,116960,916381,7170239, 56496359,449785468,3619072169]