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A182602 as a simple table

na(n)
18
221
321
42584
52584
6832040
7832040
8832040
9832040
10832040
11832040
12832040
13832040
144807526976
154807526976
164807526976
174807526976
184807526976
194807526976
204807526976
214807526976
224807526976
234807526976
244807526976

[8,21,21,2584,2584,832040,832040,832040,832040,
 832040,832040,832040,832040,4807526976,4807526976,
 4807526976,4807526976,4807526976,4807526976,
 4807526976,4807526976,4807526976,4807526976,
 4807526976]