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A170690 as a simple table

na(n)
01
19
272
3576
44608
536864
6294912
72359296
818874368
9150994944
101207959552
119663676416
1277309411328
13618475290624
144947802324992
1539582418599936
16316659348799488
172533274790395904
1820266198323167232
19162129586585337856

[1,9,72,576,4608,36864,294912,2359296,18874368,
 150994944,1207959552,9663676416,77309411328,
 618475290624,4947802324992,39582418599936,
 316659348799488,2533274790395904,
 20266198323167232,162129586585337856]