| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1110 |
| 3 | 3120 |
| 4 | 13124120 |
| 5 | 1423324120 |
| 6 | 3433525120 |
| 7 | 253453523120 |
| 8 | 552463522120 |
| 9 | 16652443722120 |
| 10 | 1736453423823120 |
| 11 | 182736254453724120 |
| 12 | 283726355463724120 |
| 13 | 284736455453823120 |
| 14 | 383736555463722120 |
[1,0,1110,3120,13124120,1423324120,3433525120, 253453523120,552463522120,16652443722120, 1736453423823120,182736254453724120, 283726355463724120,284736455453823120, 383736555463722120] |