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A189773 as a simple table

na(n)
12
216
3512
437976
57767740
63848548036
75404382625660
819742364192283882
9203905576411742503606
105585800755853929115668714

[2,16,512,37976,7767740,3848548036,5404382625660,
 19742364192283882,203905576411742503606,
 5585800755853929115668714]