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| n | a(n) |
|---|---|
| 1 | 14 |
| 2 | 41 |
| 3 | 1144 |
| 4 | 1414 |
| 5 | 1441 |
| 6 | 4114 |
| 7 | 4141 |
| 8 | 4411 |
| 9 | 111444 |
| 10 | 114144 |
| 11 | 114414 |
| 12 | 114441 |
| 13 | 141144 |
| 14 | 141414 |
| 15 | 141441 |
| 16 | 144114 |
| 17 | 144141 |
| 18 | 144411 |
| 19 | 411144 |
| 20 | 411414 |
| 21 | 411441 |
| 22 | 414114 |
| 23 | 414141 |
| 24 | 414411 |
| 25 | 441114 |
| 26 | 441141 |
| 27 | 441411 |
| 28 | 444111 |
| 29 | 11114444 |
| 30 | 11141444 |
[14,41,1144,1414,1441,4114,4141,4411,111444, 114144,114414,114441,141144,141414,141441,144114, 144141,144411,411144,411414,411441,414114,414141, 414411,441114,441141,441411,444111,11114444, 11141444] |