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A187726 as a simple table

na(n)
13520
246003
3641743
49823368
5148669520
62287444987
735118814718
8539993233442
98301474121906
10127642216451132
111962496986726439
1230174249793987854
13463939440774903934
147133234356724529920
15109676111704087494791

[3520,46003,641743,9823368,148669520,2287444987,
 35118814718,539993233442,8301474121906,
 127642216451132,1962496986726439,
 30174249793987854,463939440774903934,
 7133234356724529920,109676111704087494791]