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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 880 |
| 3 | 35520 |
| 4 | 1422080 |
| 5 | 56888320 |
| 6 | 2275553280 |
| 7 | 91022213120 |
| 8 | 3640888852480 |
| 9 | 145635555409920 |
| 10 | 5825422221639680 |
| 11 | 233016888886558720 |
| 12 | 9320675555546234880 |
| 13 | 372827022222184939520 |
| 14 | 14913080888888739758080 |
| 15 | 596523235555554959032320 |
| 16 | 23860929422222219836129280 |
[20,880,35520,1422080,56888320,2275553280, 91022213120,3640888852480,145635555409920, 5825422221639680,233016888886558720, 9320675555546234880,372827022222184939520, 14913080888888739758080,596523235555554959032320, 23860929422222219836129280] |