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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 28 |
| 3 | 350 |
| 4 | 5020 |
| 5 | 78023 |
| 6 | 1278340 |
| 7 | 21740636 |
| 8 | 380161308 |
| 9 | 6792111260 |
| 10 | 123448657904 |
| 11 | 2275311657814 |
| 12 | 42427160829508 |
| 13 | 798933055335618 |
| 14 | 15171376583787800 |
| 15 | 290199619787772728 |
| 16 | 5586346847185229596 |
| 17 | 108141141737193646020 |
[1,3,28,350,5020,78023,1278340,21740636,380161308, 6792111260,123448657904,2275311657814, 42427160829508,798933055335618,15171376583787800, 290199619787772728,5586346847185229596, 108141141737193646020] |