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A318591 as a simple table

n a(n)
0 1
1 1
2 5
3 30
4 165
5 1001
6 6198
7 38760
8 245157
9 1562331
10 10015005
11 64512240
12 417226230
13 2707475148
14 17620076360
15 114955810530
16 751616304549
17 4923689695575
18 32308782871911
19 212327989773900
20 1397281501935165
21 9206478467531865
22 60727722660586800
23 400978991944396320

[1,1,5,30,165,1001,6198,38760,245157,1562331,
 10015005,64512240,417226230,2707475148,
 17620076360,114955810530,751616304549,
 4923689695575,32308782871911,212327989773900,
 1397281501935165,9206478467531865,
 60727722660586800,400978991944396320]

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Last modified May 25 22:17 EDT 2019. Contains 323576 sequences. (Running on oeis4.)