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A177908 as a simple table

na(n)
11
27
3889
42359
5299593
62033143
713549249
842931441
9100170217
10188097287
11233727361
12310935751
13685169191
141515836567
153606045247
164566096913
175452293007
186620620783
1912721617559
2013162910047
2124088984969
2229683374847
2330987132463
2463388785719
2565576560063
2692349997537

[1,7,889,2359,299593,2033143,13549249,42931441,
 100170217,188097287,233727361,310935751,685169191,
 1515836567,3606045247,4566096913,5452293007,
 6620620783,12721617559,13162910047,24088984969,
 29683374847,30987132463,63388785719,65576560063,
 92349997537]