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A004673 as a simple table

na(n)
01
10
20
315590400
436957286800
515284192071680
62099603881267200
7134803322124134400
84960017097962973200
9119289241340847513600
102051414989573311774720
1126894038407511734144000
12281804009505443595441600

[1,0,0,15590400,36957286800,15284192071680,
 2099603881267200,134803322124134400,
 4960017097962973200,119289241340847513600,
 2051414989573311774720,26894038407511734144000,
 281804009505443595441600]