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A002190 as a simple table

n a(n)
0 0
1 1
2 1
3 4
4 33
5 456
6 9460
7 274800
8 10643745
9 530052880
10 32995478376
11 2510382661920
12 229195817258100
13 24730000147369440
14 3113066087894608560
15 452168671458789789504
16 75059305956331837485345
17 14121026957032156557396000
18 2988687741694684876495689040

[0,1,1,4,33,456,9460,274800,10643745,530052880,
 32995478376,2510382661920,229195817258100,
 24730000147369440,3113066087894608560,
 452168671458789789504,75059305956331837485345,
 14121026957032156557396000,
 2988687741694684876495689040]

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Last modified April 11 18:00 EDT 2021. Contains 342888 sequences. (Running on oeis4.)