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A247435 as a simple table

na(n)
2156
339
478
552
6156
7156
852
939
1078
11156
1226
1314
1413
15156
1639
1778
1852
19156
20156
2152
2239
2378
24156
2526
2614
2713
28156
2939
3078
3152
32156
33156
3452
3539
3678
37156
3826
3914
4013
41156
4239
4378
4452
45156
46156
4752
4839
4978
50156
5126
5214
5313
54156
5539
5678
5752
58156
59156
6052
6139

[156,39,78,52,156,156,52,39,78,156,26,14,13,156,
 39,78,52,156,156,52,39,78,156,26,14,13,156,39,78,
 52,156,156,52,39,78,156,26,14,13,156,39,78,52,156,
 156,52,39,78,156,26,14,13,156,39,78,52,156,156,52,
 39]