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A091527 as a simple table

n a(n)
0 1
1 4
2 30
3 256
4 2310
5 21504
6 204204
7 1966080
8 19122246
9 187432960
10 1848483780
11 18320719872
12 182327718300
13 1820797698048
14 18236779032600
15 183120225632256
16 1842826521244230
17 18581317012684800
18 187679234340049620
19 1898554215471513600
20 19232182592635611060

[1,4,30,256,2310,21504,204204,1966080,19122246,
 187432960,1848483780,18320719872,182327718300,
 1820797698048,18236779032600,183120225632256,
 1842826521244230,18581317012684800,
 187679234340049620,1898554215471513600,
 19232182592635611060]

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Last modified March 29 02:19 EDT 2020. Contains 333104 sequences. (Running on oeis4.)