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A003094
as a simple table
n
a(n)
0
1
1
1
2
1
3
2
4
6
5
20
6
99
7
646
8
5974
9
71885
10
1052805
11
17449299
12
313372298
13
5942258308
[1,1,1,2,6,20,99,646,5974,71885,1052805,17449299, 313372298,5942258308]