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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 144 |
| 3 | 441 |
| 4 | 1475244 |
| 5 | 4425741 |
| 6 | 161247384 |
| 7 | 483742161 |
| 8 | 14752475244 |
| 9 | 44257425741 |
| 10 | 1612475247384 |
| 11 | 4837425742161 |
| 12 | 147524752475244 |
| 13 | 442574257425741 |
| 14 | 16124752475247384 |
| 15 | 48374257425742161 |
[0,144,441,1475244,4425741,161247384,483742161, 14752475244,44257425741,1612475247384, 4837425742161,147524752475244,442574257425741, 16124752475247384,48374257425742161] |