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A222604 as a simple table

n a(n)
1 1
2 0
3 0
4 6
5 20
6 20
7 70
8 685
9 2808
10 5370
11 21294
12 123410
13 514792
14 1341616
15 5472216
16 25106526
17 105042770
18 321557310
19 1329068686
20 5447475968
21 22826820144
22 76079350800
23 316839140020
24 1228204709225
25 5153985361728
26 17971182592538

[1,0,0,6,20,20,70,685,2808,5370,21294,123410,
 514792,1341616,5472216,25106526,105042770,
 321557310,1329068686,5447475968,22826820144,
 76079350800,316839140020,1228204709225,
 5153985361728,17971182592538]

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Last modified September 21 14:10 EDT 2021. Contains 347598 sequences. (Running on oeis4.)