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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 99 |
| 4 | 2616 |
| 5 | 95625 |
| 6 | 4468608 |
| 7 | 254426571 |
| 8 | 17087348736 |
| 9 | 1322490908817 |
| 10 | 115902895680000 |
| 11 | 11345706419279859 |
| 12 | 1226971723559141376 |
| 13 | 145275861381024623769 |
| 14 | 18691551435638516649984 |
| 15 | 2596726179631913433046875 |
| 16 | 387404350400960574932385792 |
[1,1,6,99,2616,95625,4468608,254426571, 17087348736,1322490908817,115902895680000, 11345706419279859,1226971723559141376, 145275861381024623769,18691551435638516649984, 2596726179631913433046875, 387404350400960574932385792] |