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A079577
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
18
6
67
7
248
8
1005
9
4068
10
16955
11
71090
12
302194
13
1294752
14
5598368
15
24382450
[1,1,2,6,18,67,248,1005,4068,16955,71090,302194, 1294752,5598368,24382450]