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A051451 as a simple table

na(n)
11
22
36
412
560
6420
7840
82520
927720
10360360
11720720
1212252240
13232792560
145354228880
1526771144400
1680313433200
172329089562800
1872201776446800
19144403552893600
205342931457063200
21219060189739591200
229419588158802421600
23442720643463713815200

[1,2,6,12,60,420,840,2520,27720,360360,720720,
 12252240,232792560,5354228880,26771144400,
 80313433200,2329089562800,72201776446800,
 144403552893600,5342931457063200,
 219060189739591200,9419588158802421600,
 442720643463713815200]