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A191570 as a simple table

na(n)
12
28
364
4608
58404
6216892
79337976
8632108017
967457332362
1011825770678093
113349770239089324
121533187995312783695
131132523827035520870024

[2,8,64,608,8404,216892,9337976,632108017,
 67457332362,11825770678093,3349770239089324,
 1533187995312783695,1132523827035520870024]