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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 110 |
| 3 | 4676 |
| 4 | 336024 |
| 5 | 36975312 |
| 6 | 5767774272 |
| 7 | 1211248149120 |
| 8 | 329458632906240 |
| 9 | 112674914230625280 |
| 10 | 47323458446223052800 |
| 11 | 23945670579525578956800 |
| 12 | 14367402268047801262080000 |
| 13 | 10085916404559453257318400000 |
| 14 | 8189764118253280338411847680000 |
| 15 | 7616480630446754091029242183680000 |
[0,6,110,4676,336024,36975312,5767774272, 1211248149120,329458632906240,112674914230625280, 47323458446223052800,23945670579525578956800, 14367402268047801262080000, 10085916404559453257318400000, 8189764118253280338411847680000, 7616480630446754091029242183680000] |