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A081075 as a simple table

na(n)
15
252
3374
42581
517708
6121390
7832037
85702884
939088166
10267914293
111836311900
1212586269022
1386267571269
14591286729876
154052739537878
1627777890035285
17190392490709132
181304969544928654
198944394323791461

[5,52,374,2581,17708,121390,832037,5702884,
 39088166,267914293,1836311900,12586269022,
 86267571269,591286729876,4052739537878,
 27777890035285,190392490709132,1304969544928654,
 8944394323791461]