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A363200
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
15
6
55
7
248
8
1256
9
6844
10
38930
11
226961
12
1345641
13
8072770
14
48882245
15
298237393
[1,1,2,5,15,55,248,1256,6844,38930,226961,1345641, 8072770,48882245,298237393]