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A291315 as a simple table

n a(n)
1 1
2 3
3 27
4 312
5 4140
6 58806
7 876492
8 13524300
9 214168536
10 3460901967
11 56842100298
12 946076020551
13 15922147355532
14 270496012834332
15 4632597495220104
16 79896692540736729
17 1386424262414762046
18 24188862129358547349
19 424059773742487363743
20 7466416997545500727257
21 131972899585564980561060

[1,3,27,312,4140,58806,876492,13524300,214168536,
 3460901967,56842100298,946076020551,
 15922147355532,270496012834332,4632597495220104,
 79896692540736729,1386424262414762046,
 24188862129358547349,424059773742487363743,
 7466416997545500727257,131972899585564980561060]

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Last modified December 1 14:10 EST 2021. Contains 349430 sequences. (Running on oeis4.)