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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 68 |
| 3 | 2816 |
| 4 | 56104 |
| 5 | 6709692 |
| 6 | 277234340 |
| 7 | 17549848472 |
| 8 | 989144587700 |
| 9 | 56401739559508 |
| 10 | 3243490787117120 |
| 11 | 185616775824121080 |
| 12 | 10613030876477577172 |
| 13 | 608452096582821248424 |
| 14 | 34821076779055371520292 |
| 15 | 1994342945781220272004220 |
[0,68,2816,56104,6709692,277234340,17549848472, 989144587700,56401739559508,3243490787117120, 185616775824121080,10613030876477577172, 608452096582821248424,34821076779055371520292, 1994342945781220272004220] |