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A280628 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 19
6 109
7 739
8 3889
9 35641
10 292681
11 3753721
12 37275121
13 500577499
14 5709311029
15 91718242219
16 1254902705569
17 22737318482161
18 350061261777361
19 6983681901945841
20 120872805166945441
21 2676021948941279779
22 51564789352080559549
23 1243547540389481251699
24 26284030671328082426449
25 686920343453752746986281
26 15848108292907342195314841
27 446624144083900575607651561

[1,1,1,1,1,19,109,739,3889,35641,292681,3753721,
 37275121,500577499,5709311029,91718242219,
 1254902705569,22737318482161,350061261777361,
 6983681901945841,120872805166945441,
 2676021948941279779,51564789352080559549,
 1243547540389481251699,26284030671328082426449,
 686920343453752746986281,
 15848108292907342195314841,
 446624144083900575607651561]

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Last modified June 30 09:38 EDT 2022. Contains 354920 sequences. (Running on oeis4.)