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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 704 |
| 3 | 1936 |
| 4 | 34816 |
| 5 | 172992 |
| 6 | 2053216 |
| 7 | 12950528 |
| 8 | 131772320 |
| 9 | 929033280 |
| 10 | 8815545344 |
| 11 | 65895014896 |
| 12 | 602776037920 |
| 13 | 4662229953024 |
| 14 | 41734072588384 |
| 15 | 329907085742480 |
| 16 | 2911856599577984 |
| 17 | 23363245790844864 |
| 18 | 204187515832240736 |
[0,704,1936,34816,172992,2053216,12950528, 131772320,929033280,8815545344,65895014896, 602776037920,4662229953024,41734072588384, 329907085742480,2911856599577984, 23363245790844864,204187515832240736] |