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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 7744 |
| 3 | 473344 |
| 4 | 73344434433347373773443373373444 |
| 5 | 447337374477734734334374744437444 |
| 6 | 437374344733334774447744773373477443344 |
| 7 | 73444333373444774773333473377377773344743344373433344 |
[4,7744,473344,73344434433347373773443373373444, 447337374477734734334374744437444, 437374344733334774447744773373477443344, 73444333373444774773333473377377773344743344373433\ 344] |