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A274339 as a simple table

na(n)
115
224
318
415
524
618
715
824
918
1015
1124
1218
1315
1424
1518
1615
1724
1818
1915
2024
2118
2215
2324
2418
2515
2624
2718
2815
2924
3018
3115
3224
3318
3415
3524
3618
3715
3824
3918
4015
4124
4218
4315
4424
4518
4615
4724
4818
4915
5024
5118
5215
5324
5418
5515
5624
5718
5815
5924
6018

[15,24,18,15,24,18,15,24,18,15,24,18,15,24,18,15,
 24,18,15,24,18,15,24,18,15,24,18,15,24,18,15,24,
 18,15,24,18,15,24,18,15,24,18,15,24,18,15,24,18,
 15,24,18,15,24,18,15,24,18,15,24,18]