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A099717
as a simple table
n
a(n)
0
1
1
2
2
9
3
70
4
798
5
12230
6
238979
7
5746740
8
165778237
9
5626476014
10
221330040771
11
9950747684006
[1,2,9,70,798,12230,238979,5746740,165778237, 5626476014,221330040771,9950747684006]