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A257069 as a simple table

na(n)
14
259
3713
42187
516384
633048
7106056
8217603
9523733
10823543
112097152
123014848
135663370
148603223
1514688611
1619487171
1735831808
1845765000
1970508164
2094687187
21139133363
22170859375
23268435456
24322831872
25448523376
26563223955
27760729349

[4,59,713,2187,16384,33048,106056,217603,523733,
 823543,2097152,3014848,5663370,8603223,14688611,
 19487171,35831808,45765000,70508164,94687187,
 139133363,170859375,268435456,322831872,448523376,
 563223955,760729349]