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A056290 as a simple table

na(n)
10
20
30
40
524
6300
72400
815750
992680
10510288
112691600
1213793850
1369309240
14343499100
151686135352
168221421250
1739901776360
18193053923860
19932142850800
204495236287850
2121664357532920
22104388118174500
23503044634004000
242425003910574000
2511696087875731600

[0,0,0,0,24,300,2400,15750,92680,510288,2691600,
 13793850,69309240,343499100,1686135352,8221421250,
 39901776360,193053923860,932142850800,
 4495236287850,21664357532920,104388118174500,
 503044634004000,2425003910574000,
 11696087875731600]