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A174782 as a simple table

n a(n)
1 0
2 1
3 3
4 54
5 250
6 1950
7 10206
8 64288
9 350064
10 2065500
11 11509300
12 66905256
13 380767608
14 2226036904
15 12949377000
16 76842172800
17 457297336576
18 2766381692688
19 16849247813424
20 104116268476000
21 64904382495120

[0,1,3,54,250,1950,10206,64288,350064,2065500,
 11509300,66905256,380767608,2226036904,
 12949377000,76842172800,457297336576,
 2766381692688,16849247813424,104116268476000,
 64904382495120]

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Last modified December 6 09:25 EST 2019. Contains 329791 sequences. (Running on oeis4.)