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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 400 |
| 4 | 18208 |
| 5 | 1400418 |
| 6 | 113949472 |
| 7 | 8501873308 |
| 8 | 640715412642 |
| 9 | 48666334943666 |
| 10 | 3688979364397286 |
| 11 | 279499707637225516 |
| 12 | 21180942802336955158 |
| 13 | 1605155579613083173810 |
| 14 | 121641724625925000663242 |
[0,0,400,18208,1400418,113949472,8501873308, 640715412642,48666334943666,3688979364397286, 279499707637225516,21180942802336955158, 1605155579613083173810,121641724625925000663242] |