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A253723 as a simple table

na(n)
12
24
35
47
58
69
711
812
913
1014
1115
1217
1318
1419
1520
1622
1723
1824
1925
2026
2127
2228
2330
2431
2532
2633
2734
2835
2936
3038

[2,4,5,7,8,9,11,12,13,14,15,17,18,19,20,22,23,24,
 25,26,27,28,30,31,32,33,34,35,36,38]