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A228742 as a simple table

na(n)
128
2185
3696
41943
54504
69191
717088
829589
948436
1075757
11114104
12166491
13236432
14327979
15445760
16595017
17781644
181012225
191294072
201635263
212044680
222532047
233107968
243783965
254572516
265487093
276542200
287753411
299137408
3010712019

[28,185,696,1943,4504,9191,17088,29589,48436,
 75757,114104,166491,236432,327979,445760,595017,
 781644,1012225,1294072,1635263,2044680,2532047,
 3107968,3783965,4572516,5487093,6542200,7753411,
 9137408,10712019]