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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 528 |
| 2 | 183888 |
| 3 | 16906176 |
| 4 | 397256784 |
| 5 | 4631931360 |
| 6 | 34414462656 |
| 7 | 187481094528 |
| 8 | 814924380240 |
| 9 | 2975491484496 |
| 10 | 9486490093920 |
| 11 | 27053228195136 |
| 12 | 70486041140928 |
| 13 | 169930790281056 |
| 14 | 384163798531968 |
[1,528,183888,16906176,397256784,4631931360, 34414462656,187481094528,814924380240, 2975491484496,9486490093920,27053228195136, 70486041140928,169930790281056,384163798531968] |