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A251912 as a simple table

na(n)
149436
2950384
3950384
418245824
534096384
618245824
7351040004
81228480800
91228480800
10351040004
116755376172
1244527823912
1383861378128
1444527823912
156755376172
16130017259448
171618348274612
185801103610852
195801103610852

[49436,950384,950384,18245824,34096384,18245824,
 351040004,1228480800,1228480800,351040004,
 6755376172,44527823912,83861378128,44527823912,
 6755376172,130017259448,1618348274612,
 5801103610852,5801103610852]