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A056269 as a simple table

na(n)
10
20
30
424
5240
61560
78400
840800
9186480
10818280
113498000
1214674440
1360780720
14249393480
151016542560
164123132800
1716664094960
1867171179600
19270232006800
201085569963080
214356217672800
2217466683473800

[0,0,0,24,240,1560,8400,40800,186480,818280,
 3498000,14674440,60780720,249393480,1016542560,
 4123132800,16664094960,67171179600,270232006800,
 1085569963080,4356217672800,17466683473800]