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A304287 as a simple table

na(n)
15
23
3524
4414362
5964900433080
6568112044247363806135385
7532690079132413282557643073103806291708903760733

[5,3,524,414362,964900433080,
 568112044247363806135385,
 532690079132413282557643073103806291708903760733]