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A251858 as a simple table

na(n)
12506
223664
323664
4245388
5459952
6245388
72525037
810413561
910413561
102525037
1125675786
12216245728
13486474024
14216245728
1525675786
16261035198
174504504613
1820861600041
1920861600041
204504504613
21261035198
222662774377
2395484824630

[2506,23664,23664,245388,459952,245388,2525037,
 10413561,10413561,2525037,25675786,216245728,
 486474024,216245728,25675786,261035198,4504504613,
 20861600041,20861600041,4504504613,261035198,
 2662774377,95484824630]