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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 1 |
| 2 | 1411 |
| 3 | 1441 |
| 4 | 3451 |
| 5 | 15341331 |
| 6 | 25244341 |
| 7 | 2544432241 |
| 8 | 2574235221 |
| 9 | 173554237221 |
| 10 | 374524337231 |
| 11 | 473534635231 |
| 12 | 37163544833221 |
| 13 | 1827263544833231 |
| 14 | 3827262544835241 |
| 15 | 4827263554637231 |
| 16 | 3837364554537221 |
[4,1,1411,1441,3451,15341331,25244341,2544432241, 2574235221,173554237221,374524337231,473534635231, 37163544833221,1827263544833231,3827262544835241, 4827263554637231,3837364554537221] |