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A299870 as a simple table

na(n)
17
270
3693
46936
569363
6693624
76936243
869362433
9693624324
106936243243
1169362432430
12693624324303
136936243243024
1469362432430243
15693624324302427
166936243243024273
1769362432430242733
18693624324302427324
196936243243024273243
2069362432430242732426
21693624324302427324262
226936243243024273242622

[7,70,693,6936,69363,693624,6936243,69362433,
 693624324,6936243243,69362432430,693624324303,
 6936243243024,69362432430243,693624324302427,
 6936243243024273,69362432430242733,
 693624324302427324,6936243243024273243,
 69362432430242732426,693624324302427324262,
 6936243243024273242622]