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A004381 as a simple table

na(n)
01
18
2120
32024
435960
5658008
612271512
7231917400
84426165368
985113005120
101646492110120
1132006008361808
12624668654531480
1312233149001721760
14240260199935164200
154730523156632595024

[1,8,120,2024,35960,658008,12271512,231917400,
 4426165368,85113005120,1646492110120,
 32006008361808,624668654531480,12233149001721760,
 240260199935164200,4730523156632595024]