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A147744 as a simple table

na(n)
11
22
36
424
5120
6720
74608
833952
9305092
102822386
1130933326
12360660964
134441970306
1460411890162

[1,2,6,24,120,720,4608,33952,305092,2822386,
 30933326,360660964,4441970306,60411890162]