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A000183 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 2
6 20
7 144
8 1265
9 12072
10 126565
11 1445100
12 17875140
13 238282730
14 3407118041
15 52034548064
16 845569542593
17 14570246018686
18 265397214435860
19 5095853023109484
20 102877234050493609
21 2178674876680100744
22 48296053720501168037
23 1118480911876659396600

[0,0,0,1,2,20,144,1265,12072,126565,1445100,
 17875140,238282730,3407118041,52034548064,
 845569542593,14570246018686,265397214435860,
 5095853023109484,102877234050493609,
 2178674876680100744,48296053720501168037,
 1118480911876659396600]

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Last modified February 19 16:28 EST 2018. Contains 299356 sequences. (Running on oeis4.)