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A173843 as a simple table

na(n)
01
11
22
36
412
572
6336
72640
817760
9175680
101543680
1118385920
12199019520
132771112960
1435611269120
15567422392320
168437755432960
17151385755852800
182556188496691200
1950989753530777600
20963558923688345600
2121152552961009254400
22442230750973683302400

[1,1,2,6,12,72,336,2640,17760,175680,1543680,
 18385920,199019520,2771112960,35611269120,
 567422392320,8437755432960,151385755852800,
 2556188496691200,50989753530777600,
 963558923688345600,21152552961009254400,
 442230750973683302400]