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A197975 as a simple table

n a(n)
1 3
2 20
3 254
4 4633
5 110408
6 3243618
7 113177496
8 4570858599
9 209655304353
10 10763674952098
11 611433842280388
12 38071427445729200
13 2578294348444597267
14 188670154792420320214
15 14834716200104606205407
16 1247263229999781126495328
17 111661618863544248806155259

[3,20,254,4633,110408,3243618,113177496,
 4570858599,209655304353,10763674952098,
 611433842280388,38071427445729200,
 2578294348444597267,188670154792420320214,
 14834716200104606205407,1247263229999781126495328,
 111661618863544248806155259]

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Last modified October 21 14:18 EDT 2021. Contains 348155 sequences. (Running on oeis4.)