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A231824 as a simple table

na(n)
18
2439
321770
41043604
549913988
62386203232
7114066364087
85452552422721
9260639820308206
1012458949924513786
11595555266275826559
1228468375889842472535
131360828238560274914467
1465049495673466518331031

[8,439,21770,1043604,49913988,2386203232,
 114066364087,5452552422721,260639820308206,
 12458949924513786,595555266275826559,
 28468375889842472535,1360828238560274914467,
 65049495673466518331031]