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A307940 as a simple table

n a(n)
1 1
2 1
3 2
4 8
5 28
6 128
7 616
8 3246
9 18277
10 109143
11 687012
12 4534864
13 31269292
14 224515730
15 1674200760
16 12937083460
17 103396000242
18 853266369103
19 7260005391139
20 63604089876714
21 573070009421688
22 5304309681566996
23 50386117123977631
24 490737093714045784
25 4896284341878168342
26 50004967889113301578
27 522348075672187803146
28 5576978585271447925911
29 60819137853681816353455
30 677034453647710270583612
31 7688697614189589138274128

[1,1,2,8,28,128,616,3246,18277,109143,687012,
 4534864,31269292,224515730,1674200760,12937083460,
 103396000242,853266369103,7260005391139,
 63604089876714,573070009421688,5304309681566996,
 50386117123977631,490737093714045784,
 4896284341878168342,50004967889113301578,
 522348075672187803146,5576978585271447925911,
 60819137853681816353455,677034453647710270583612,
 7688697614189589138274128]

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Last modified September 26 12:07 EDT 2020. Contains 337371 sequences. (Running on oeis4.)