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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 80 |
| 2 | 2430 |
| 3 | 53760 |
| 4 | 1050000 |
| 5 | 19595520 |
| 6 | 363031200 |
| 7 | 6812467200 |
| 8 | 130947062400 |
| 9 | 2594592000000 |
| 10 | 53182390060800 |
| 11 | 1129830653952000 |
| 12 | 24898991749632000 |
| 13 | 569337009905664000 |
| 14 | 13505007035520000000 |
| 15 | 332172220849717248000 |
[1,80,2430,53760,1050000,19595520,363031200, 6812467200,130947062400,2594592000000, 53182390060800,1129830653952000,24898991749632000, 569337009905664000,13505007035520000000, 332172220849717248000] |