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A221283
as a simple table
n
a(n)
0
1
1
6
2
38
3
291
4
2374
5
20254
6
180184
7
1634372
8
15037909
9
139847905
10
1311179363
11
12372781988
[1,6,38,291,2374,20254,180184,1634372,15037909, 139847905,1311179363,12372781988]