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A111683 as a simple table

na(n)
22
33
440
55
6576
711767
8221824
9168561
106371200
11174442081
124680778752
134377478573
14202076363776
157342081491375
16260552186822656
17226934809133761
1814420591159943168
19677361585374052121
2030335097991823360000

[2,3,40,5,576,11767,221824,168561,6371200,
 174442081,4680778752,4377478573,202076363776,
 7342081491375,260552186822656,226934809133761,
 14420591159943168,677361585374052121,
 30335097991823360000]