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A302859 as a simple table

na(n)
12
27
337
4241
51801
615121
7141121
81451521
916329601
10199584001
1137362124801
12566658892801
139153720576001
1423112569077678080001
15186134520519971831808000001

[2,7,37,241,1801,15121,141121,1451521,16329601,
 199584001,37362124801,566658892801,9153720576001,
 23112569077678080001,186134520519971831808000001]