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A060977
as a simple table
n
a(n)
1
0
2
1
3
1
4
6
5
27
6
208
7
1755
8
16363
9
161685
10
1736749
11
20022517
12
250566242
13
3359504253
[0,1,1,6,27,208,1755,16363,161685,1736749, 20022517,250566242,3359504253]