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A355457 as a simple table

na(n)
12
23
34
47
515
626
731
843
998
10117
11140
12215
13540
141945
1522279
1638459
1739461
1866869
1969328
204047994
214615259
225617480
235898979
249685120
259751023

[2,3,4,7,15,26,31,43,98,117,140,215,540,1945,
 22279,38459,39461,66869,69328,4047994,4615259,
 5617480,5898979,9685120,9751023]