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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 144 |
| 3 | 3480 |
| 4 | 95616 |
| 5 | 2995296 |
| 6 | 106308864 |
| 7 | 4224923520 |
| 8 | 186254217216 |
| 9 | 9025003101696 |
| 10 | 477123118608384 |
| 11 | 27334467671746560 |
| 12 | 1687499455653052416 |
| 13 | 111689161007888080896 |
| 14 | 7890849624188124463104 |
[0,6,144,3480,95616,2995296,106308864,4224923520, 186254217216,9025003101696,477123118608384, 27334467671746560,1687499455653052416, 111689161007888080896,7890849624188124463104] |