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A049368
as a simple table
n
a(n)
1
1
2
1
3
1
4
3
5
6
6
18
7
55
8
230
9
1063
10
6161
11
41004
12
312782
13
2618995
14
23549346
15
222764216
[1,1,1,3,6,18,55,230,1063,6161,41004,312782, 2618995,23549346,222764216]