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A166541 as a simple table

na(n)
01
19
272
3576
44608
536864
6294912
72359296
818874368
9150994944
101207959552
119663676416
1277309411292
13618475290048
144947802318116
1539582418526784
16316659348069120
172533274783391744
1820266198257844224
19162129585988435968

[1,9,72,576,4608,36864,294912,2359296,18874368,
 150994944,1207959552,9663676416,77309411292,
 618475290048,4947802318116,39582418526784,
 316659348069120,2533274783391744,
 20266198257844224,162129585988435968]