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A140093 as a simple table

n a(n)
3 1
4 0
5 3
6 0
7 12
8 0
9 54
10 0
11 264
12 0
13 1365
14 0
15 7344
16 0
17 40698
18 0
19 230736
20 0
21 1332045
22 0
23 7803900
24 0
25 46280520
26 0
27 277294752
28 0
29 1676056044
30 0
31 10207492512
32 0
33 62576750610
34 0
35 385856498592
36 0
37 2391506423565
38 0
39 14890534347780
40 0

[1,0,3,0,12,0,54,0,264,0,1365,0,7344,0,40698,0,
 230736,0,1332045,0,7803900,0,46280520,0,277294752,
 0,1676056044,0,10207492512,0,62576750610,0,
 385856498592,0,2391506423565,0,14890534347780,0]

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Last modified September 26 17:30 EDT 2021. Contains 347670 sequences. (Running on oeis4.)