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A105480 as a simple table

n a(n)
4 1
5 4
6 20
7 100
8 525
9 2912
10 17052
11 105240
12 683100
13 4652340
14 33168850
15 246999480
16 1917186635
17 15480884720
18 129811538960
19 1128494172720
20 10155257740443
21 94465951576560
22 907162152191470
23 8982422995787780
24 91603484234843812

[1,4,20,100,525,2912,17052,105240,683100,4652340,
 33168850,246999480,1917186635,15480884720,
 129811538960,1128494172720,10155257740443,
 94465951576560,907162152191470,8982422995787780,
 91603484234843812]

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Last modified February 20 22:51 EST 2019. Contains 320362 sequences. (Running on oeis4.)