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A054769
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
5
6
17
7
67
8
324
9
1777
10
11054
11
76793
12
591905
13
4987228
14
45712331
15
452511382
16
4812134735
[1,1,1,2,5,17,67,324,1777,11054,76793,591905, 4987228,45712331,452511382,4812134735]