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A013416 as a simple table

na(n)
01
10
20
32
40
50
640
7450
80
92240
10108000
111786050
12246400
1330888000
141647734400
1536567781250
1611531520000
171356752592000
1885195294912000
192380490964101250
201210714801920000
21153377369153840000

[1,0,0,2,0,0,40,450,0,2240,108000,1786050,246400,
 30888000,1647734400,36567781250,11531520000,
 1356752592000,85195294912000,2380490964101250,
 1210714801920000,153377369153840000]