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A139731 as a simple table

na(n)
00
13
29
381
481
54617
618225
724057
81056321
94468041
1040212369
11180512793
121624615137
138091189225
1472820703025
15420293834937
162372089560705
174422146601609
1890579297748689
19510533809732953
20938645847533601
2119416287947991337
22108935739610788465
23585556544970294777

[0,3,9,81,81,4617,18225,24057,1056321,4468041,
 40212369,180512793,1624615137,8091189225,
 72820703025,420293834937,2372089560705,
 4422146601609,90579297748689,510533809732953,
 938645847533601,19416287947991337,
 108935739610788465,585556544970294777]