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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 8 |
| 2 | 14 |
| 3 | 80 |
| 4 | 595 |
| 5 | 5016 |
| 6 | 45540 |
| 7 | 434304 |
| 8 | 4289780 |
| 9 | 43501640 |
| 10 | 450266674 |
| 11 | 4737547360 |
| 12 | 50520394470 |
| 13 | 544805327400 |
| 14 | 5931061593120 |
| 15 | 65096002327296 |
| 16 | 719512200316140 |
| 17 | 8002078308422440 |
| 18 | 89481679308557550 |
| 19 | 1005472614647991600 |
| 20 | 11347246369917801369 |
| 21 | 128560385140949059760 |
[-1,8,14,80,595,5016,45540,434304,4289780, 43501640,450266674,4737547360,50520394470, 544805327400,5931061593120,65096002327296, 719512200316140,8002078308422440, 89481679308557550,1005472614647991600, 11347246369917801369,128560385140949059760] |