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A155988 as a simple table

na(n)
01
127
2405
35103
459049
5649539
66908733
771744535
8731794257
97360989291
1073222472421
11721764371007
127060738412025
1368630377364883
14663426981193869
156382625094934119
1661149666232110753
17583701359488329915
185553501505988967477
1952683216989246691471
20498464283821334080841

[1,27,405,5103,59049,649539,6908733,71744535,
 731794257,7360989291,73222472421,721764371007,
 7060738412025,68630377364883,663426981193869,
 6382625094934119,61149666232110753,
 583701359488329915,5553501505988967477,
 52683216989246691471,498464283821334080841]