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A068550 as a simple table

na(n)
01
11
22
33
412
510
630
7105
856
9252
101260
11330
121980
132574
142002
1515015
16240240
1761880
1815912
19151164
2038760
21406980
224476780
231144066
2413728792
2524515700
266249100
2784362850
2821474180
295462730
3081940950
311270084725
32645122400

[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]