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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 216 |
| 4 | 5976 |
| 5 | 262800 |
| 6 | 16945200 |
| 7 | 1511395200 |
| 8 | 178458940800 |
| 9 | 26959810348800 |
| 10 | 5071861902240000 |
| 11 | 1162523770531200000 |
| 12 | 318880083535896960000 |
| 13 | 103120648805872938240000 |
| 14 | 38820554918130896951040000 |
| 15 | 16829499728777665273344000000 |
| 16 | 8323409867177396185818624000000 |
| 17 | 4657912954052653582049258496000000 |
[1,2,14,216,5976,262800,16945200,1511395200, 178458940800,26959810348800,5071861902240000, 1162523770531200000,318880083535896960000, 103120648805872938240000, 38820554918130896951040000, 16829499728777665273344000000, 8323409867177396185818624000000, 4657912954052653582049258496000000] |