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A002670 as a simple table

na(n)
11
22
312
472
5240
62400
7907200
84233600
925401600
101371686400
11251475840000
125532468480000
13554827553280000
1433659538232320000
1573302994372608000
164453156908135936000000
1750469111625540608000000
1863553696121051136000000

[1,2,12,72,240,2400,907200,4233600,25401600,
 1371686400,251475840000,5532468480000,
 554827553280000,33659538232320000,
 73302994372608000,4453156908135936000000,
 50469111625540608000000,63553696121051136000000]