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A154702 as a simple table

na(n)
31
47
57
636
778
836
9156
10624
11624
12156
13603
144224
157146
164224
17603
182157
1925281
2068322
2168322
2225281
232157
247318
25137622
26578130
27882340
28578130
29137622
307318
3123938
32696970
334433382
349965710
359965710
364433382
37696970
3823938

[1,7,7,36,78,36,156,624,624,156,603,4224,7146,
 4224,603,2157,25281,68322,68322,25281,2157,7318,
 137622,578130,882340,578130,137622,7318,23938,
 696970,4433382,9965710,9965710,4433382,696970,
 23938]