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A147733 as a simple table

na(n)
11
22
36
424
5120
6624
74176
831564
9271972
102654974
1128246094
12320329694
134116736768
1454680271878

[1,2,6,24,120,624,4176,31564,271972,2654974,
 28246094,320329694,4116736768,54680271878]