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A003197
as a simple table
n
a(n)
0
1
1
10
2
46
3
186
4
706
5
2568
6
9004
7
30894
8
103832
9
343006
10
1123770
[1,10,46,186,706,2568,9004,30894,103832,343006, 1123770]