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A025966 as a simple table

na(n)
01
120
2260
32800
427216
5248640
62182720
718656000
8156544256
91296655360
1010641146880
1186744985600
12703688298496
135688011079680
1445855653642240
15368956766617600
162964331947687936
1723790756829593600

[1,20,260,2800,27216,248640,2182720,18656000,
 156544256,1296655360,10641146880,86744985600,
 703688298496,5688011079680,45855653642240,
 368956766617600,2964331947687936,
 23790756829593600]