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A155580 as a simple table

n a(n)
0 1
1 1
2 2
3 5
4 10
5 30
6 180
7 585
8 1430
9 3575
10 9100
11 31850
12 83300
13 220150
14 792540
15 11888100
16 32167800
17 87567900
18 1576222200
19 4334611050
20 11971782900
21 33194488950
22 92367273600
23 257858638800
24 722004188640
25 18050104716000

[1,1,2,5,10,30,180,585,1430,3575,9100,31850,83300,
 220150,792540,11888100,32167800,87567900,
 1576222200,4334611050,11971782900,33194488950,
 92367273600,257858638800,722004188640,
 18050104716000]

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Last modified June 13 11:39 EDT 2021. Contains 344992 sequences. (Running on oeis4.)