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A026160 as a simple table

n a(n)
1 1
2 3
3 16
4 84
5 459
6 2552
7 14377
8 81768
9 468468
10 2699596
11 15630384
12 90853864
13 529850815
14 3098789865
15 18167417169
16 106738859744
17 628304239266
18 3704621197662
19 21875951368671
20 129352256646948
21 765788776646355
22 4538617746853905
23 26926250088179529
24 159892875661323312

[1,3,16,84,459,2552,14377,81768,468468,2699596,
 15630384,90853864,529850815,3098789865,
 18167417169,106738859744,628304239266,
 3704621197662,21875951368671,129352256646948,
 765788776646355,4538617746853905,
 26926250088179529,159892875661323312]

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Last modified January 19 10:26 EST 2021. Contains 340269 sequences. (Running on oeis4.)