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A271961 as a simple table

n a(n)
1 1
2 2
3 6
4 48
5 350
6 2624
7 19788
8 164352
9 1375222
10 11676672
11 100528724
12 879042560
13 7766216812
14 69183897600
15 621144540056
16 5617045733376
17 51099366332838
18 467284485996544
19 4293452339931012
20 39617950774198272
21 366977680831584068
22 3411064524143329280
23 31806303401026218792
24 297435647894402105344
25 2788846295384191083196
26 26212988486868078166016
27 246938491597204310266696

[1,2,6,48,350,2624,19788,164352,1375222,11676672,
 100528724,879042560,7766216812,69183897600,
 621144540056,5617045733376,51099366332838,
 467284485996544,4293452339931012,
 39617950774198272,366977680831584068,
 3411064524143329280,31806303401026218792,
 297435647894402105344,2788846295384191083196,
 26212988486868078166016,246938491597204310266696]

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Last modified August 3 17:21 EDT 2021. Contains 346439 sequences. (Running on oeis4.)