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A028752 as a simple table

na(n)
12
25
36
47
58
611
714
815
917
1018
1119
1220
1321
1423
1524
1626
1728
1829
1931
2032
2133
2234
2335
2437
2538

[2,5,6,7,8,11,14,15,17,18,19,20,21,23,24,26,28,29,
 31,32,33,34,35,37,38]