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A082471 as a simple table

na(n)
11
21
32
46
524
6144
71296
818144
9399168
1013970880
11782369280
1270413235200
1310209919104000
142389121070336000
15903087764587008000
16551786624162661888000
17545165184672709945344000
18871173965106990492659712000
192251984699801570423525355520000

[1,1,2,6,24,144,1296,18144,399168,13970880,
 782369280,70413235200,10209919104000,
 2389121070336000,903087764587008000,
 551786624162661888000,545165184672709945344000,
 871173965106990492659712000,
 2251984699801570423525355520000]