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A056285 as a simple table

na(n)
10
20
30
40
524
6300
72400
815750
992680
10510312
112691600
1213794150
1369309240
14343501500
151686135376
168221437000
1739901776360
18193054016840
19932142850800
204495236798162
2121664357535320
22104388120866100
23503044634004000
242425003924383900
2511696087875731624

[0,0,0,0,24,300,2400,15750,92680,510312,2691600,
 13794150,69309240,343501500,1686135376,8221437000,
 39901776360,193054016840,932142850800,
 4495236798162,21664357535320,104388120866100,
 503044634004000,2425003924383900,
 11696087875731624]