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A197973 as a simple table

na(n)
12
26
335
4327
53989
659605
71052849
821460093
9495764694
1012800845442
11365323615366
1211419131242071
13387977390372850
1414236659589753582
15561109543344974894
1623640346895461300428
171060265646084471617080
1850434955069054663240728

[2,6,35,327,3989,59605,1052849,21460093,495764694,
 12800845442,365323615366,11419131242071,
 387977390372850,14236659589753582,
 561109543344974894,23640346895461300428,
 1060265646084471617080,50434955069054663240728]