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A220231 as a simple table

n a(n)
0 1
1 4
2 22
3 184
4 2094
5 30300
6 532918
7 11041936
8 263451958
9 7114155240
10 214501732236
11 7143254501280
12 260397686968140
13 10313589262630724
14 441025376697310226
15 20250545724670230240
16 993756093394720170206
17 51903607891071021948092
18 2874779134773855301743682

[1,4,22,184,2094,30300,532918,11041936,263451958,
 7114155240,214501732236,7143254501280,
 260397686968140,10313589262630724,
 441025376697310226,20250545724670230240,
 993756093394720170206,51903607891071021948092,
 2874779134773855301743682]

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Last modified November 28 10:05 EST 2021. Contains 349401 sequences. (Running on oeis4.)