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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 405 |
| 4 | 128124 |
| 5 | 12750255 |
| 6 | 789300477 |
| 7 | 38464072830 |
| 8 | 1641724670475 |
| 9 | 64856779908606 |
| 10 | 2445752640197970 |
| 11 | 89642032274378115 |
| 12 | 3228334377697738350 |
| 13 | 115003717118946936945 |
| 14 | 4069184219056622926539 |
| 15 | 143377786266629066071740 |
| 16 | 5038841894823365860640997 |
| 17 | 176801555321207696717476200 |
[0,0,405,128124,12750255,789300477,38464072830, 1641724670475,64856779908606,2445752640197970, 89642032274378115,3228334377697738350, 115003717118946936945,4069184219056622926539, 143377786266629066071740, 5038841894823365860640997, 176801555321207696717476200] |