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A068550 as a simple table

n a(n)
0 1
1 1
2 2
3 3
4 12
5 10
6 30
7 105
8 56
9 252
10 1260
11 330
12 1980
13 2574
14 2002
15 15015
16 240240
17 61880
18 15912
19 151164
20 38760
21 406980
22 4476780
23 1144066
24 13728792
25 24515700
26 6249100
27 84362850
28 21474180
29 5462730
30 81940950
31 1270084725
32 645122400

[1,1,2,3,12,10,30,105,56,252,1260,330,1980,2574,
 2002,15015,240240,61880,15912,151164,38760,406980,
 4476780,1144066,13728792,24515700,6249100,
 84362850,21474180,5462730,81940950,1270084725,
 645122400]

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Last modified December 6 09:25 EST 2019. Contains 329791 sequences. (Running on oeis4.)