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A038720 as a simple table

na(n)
12
25
318
484
5480
63240
725200
8221760
92177280
1023587200
11279417600
123592512000
1349816166400
14741015475200
1511769069312000
16198766503936000
173556874280960000
1867224923910144000
191338096104497152000
2027978373094031360000
21613091306060513280000

[2,5,18,84,480,3240,25200,221760,2177280,23587200,
 279417600,3592512000,49816166400,741015475200,
 11769069312000,198766503936000,3556874280960000,
 67224923910144000,1338096104497152000,
 27978373094031360000,613091306060513280000]