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A001928 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 21
5 94
6 512
7 3485
8 29515
9 314474
10 4255727
11 73831813
12 1653083021
13 47941962135
14 1803010446411
15 87882300251730
16 5543501326580737

[1,1,2,6,21,94,512,3485,29515,314474,4255727,
 73831813,1653083021,47941962135,1803010446411,
 87882300251730,5543501326580737]

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Last modified February 19 16:02 EST 2019. Contains 320311 sequences. (Running on oeis4.)