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A309904 as a simple table

n a(n)
0 0
1 1
2 8
3 204
4 890
5 890
6 51311
7 286609
8 3580781
9 20875184
10 182289612
11 747240110
12 8656547082
13 8656547082
14 105545557489
15 783768630338
16 15026453160167
17 114725244868970
18 1045247300817798
19 9187315290370043
20 20586210475743186
21 20586210475743186

[0,1,8,204,890,890,51311,286609,3580781,20875184,
 182289612,747240110,8656547082,8656547082,
 105545557489,783768630338,15026453160167,
 114725244868970,1045247300817798,9187315290370043,
 20586210475743186,20586210475743186]

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Last modified July 25 22:19 EDT 2021. Contains 346294 sequences. (Running on oeis4.)