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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 10 |
| 5 | 52 |
| 6 | 34440 |
| 7 | 64144 |
| 8 | 4952480 |
| 9 | 9672256 |
| 10 | 95521188480 |
| 11 | 87161441536 |
| 12 | 511417392598515200 |
| 13 | 809054768954368 |
| 14 | 9402626177680619520 |
| 15 | 433559729330180096 |
| 16 | 70591765772239009938104320 |
| 17 | 520167571795410350915584 |
[1,10,52,34440,64144,4952480,9672256,95521188480, 87161441536,511417392598515200,809054768954368, 9402626177680619520,433559729330180096, 70591765772239009938104320, 520167571795410350915584] |