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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 210 |
| 3 | 2236 |
| 4 | 19688 |
| 5 | 141812 |
| 6 | 838816 |
| 7 | 3998456 |
| 8 | 15324708 |
| 9 | 46358876 |
| 10 | 108478966 |
| 11 | 193892860 |
| 12 | 260303408 |
| 13 | 253897632 |
| 14 | 171158018 |
| 15 | 72002088 |
| 16 | 14772512 |
[1,16,210,2236,19688,141812,838816,3998456, 15324708,46358876,108478966,193892860,260303408, 253897632,171158018,72002088,14772512] |