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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 136 |
| 4 | 12840 |
| 5 | 373780 |
| 6 | 99827160 |
| 7 | 5116799368 |
| 8 | 2751754706832 |
| 9 | 212339816996032 |
| 10 | 194478305002268064 |
| 11 | 20707051422399128416 |
| 12 | 29191372156840204219200 |
| 13 | 4055642578974004982217280 |
| 14 | 8220961603626446873042001408 |
[1,12,136,12840,373780,99827160,5116799368, 2751754706832,212339816996032,194478305002268064, 20707051422399128416,29191372156840204219200, 4055642578974004982217280, 8220961603626446873042001408] |