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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 80 |
| 2 | 3584 |
| 3 | 1760 |
| 4 | 745472 |
| 5 | 4456448 |
| 6 | 99614720 |
| 7 | 265289728 |
| 8 | 10905190400 |
| 9 | 54492397568 |
| 10 | 1065151889408 |
| 11 | 1277752770560 |
| 12 | 96619584290816 |
| 13 | 450799767388160 |
| 14 | 8321103999008768 |
| 15 | 19017153114013696 |
| 16 | 689613692941107200 |
| 17 | 3102980143258271744 |
| 18 | 55484347409204510720 |
| 19 | 30822635849723674624 |
[2,80,3584,1760,745472,4456448,99614720,265289728, 10905190400,54492397568,1065151889408, 1277752770560,96619584290816,450799767388160, 8321103999008768,19017153114013696, 689613692941107200,3102980143258271744, 55484347409204510720,30822635849723674624] |