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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 80 |
| 4 | 1088 |
| 5 | 9744 |
| 6 | 165568 |
| 7 | 4055152 |
| 8 | 147762240 |
| 9 | 7887576208 |
| 10 | 624224888096 |
| 11 | 72861217834416 |
| 12 | 12595738987019680 |
| 13 | 3224446583629649792 |
| 14 | 1224344356792821362688 |
| 15 | 689079095818717776787184 |
[1,6,80,1088,9744,165568,4055152,147762240, 7887576208,624224888096,72861217834416, 12595738987019680,3224446583629649792, 1224344356792821362688,689079095818717776787184] |