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A197974 as a simple table

na(n)
12
25
333
4312
53803
656801
71003062
820441409
9472161364
1012189944200
11347854999335
1210872213398723
13369369563065820
1413553043160362243
15534138422146939894
1622502990284669009820
171009214769013552542797
1848004835269442445650151

[2,5,33,312,3803,56801,1003062,20441409,472161364,
 12189944200,347854999335,10872213398723,
 369369563065820,13553043160362243,
 534138422146939894,22502990284669009820,
 1009214769013552542797,48004835269442445650151]