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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 100 |
| 4 | 984 |
| 5 | 11712 |
| 6 | 163200 |
| 7 | 2603520 |
| 8 | 46771200 |
| 9 | 934133760 |
| 10 | 20530298880 |
| 11 | 492355584000 |
| 12 | 12793813401600 |
| 13 | 358063276032000 |
| 14 | 10737974299852800 |
| 15 | 343513154086502400 |
| 16 | 11676590580695040000 |
| 17 | 420271561157640192000 |
| 18 | 15967576932074127360000 |
[1,2,13,100,984,11712,163200,2603520,46771200, 934133760,20530298880,492355584000,12793813401600, 358063276032000,10737974299852800, 343513154086502400,11676590580695040000, 420271561157640192000,15967576932074127360000] |