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A368954
as a simple table
n
a(n)
0
1
1
2
2
3
3
6
4
15
5
48
6
232
7
1544
8
14959
9
203333
10
3919437
11
105126522
[1,2,3,6,15,48,232,1544,14959,203333,3919437, 105126522]