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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 36 |
| 3 | 1764 |
| 4 | 92416 |
| 5 | 5267025 |
| 6 | 315630756 |
| 7 | 19684370601 |
| 8 | 1264977082944 |
| 9 | 83266957255329 |
| 10 | 5588691282002500 |
| 11 | 381203015928291216 |
| 12 | 26357375491548319296 |
| 13 | 1843677173726039815969 |
| 14 | 130261796682232750056900 |
| 15 | 9284172482167489217304900 |
| 16 | 666818520819487582805692416 |
[0,1,36,1764,92416,5267025,315630756,19684370601, 1264977082944,83266957255329,5588691282002500, 381203015928291216,26357375491548319296, 1843677173726039815969,130261796682232750056900, 9284172482167489217304900, 666818520819487582805692416] |