| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 96 |
| 4 | 1388 |
| 5 | 26960 |
| 6 | 659352 |
| 7 | 19471984 |
| 8 | 674425600 |
| 9 | 26814697056 |
| 10 | 1203912012000 |
| 11 | 60251644584384 |
| 12 | 3326134996826688 |
| 13 | 200792710948417536 |
| 14 | 13159474030202943744 |
| 15 | 930524202271542658560 |
| 16 | 70616227020854238216192 |
| 17 | 5724780985202503068533760 |
[1,2,10,96,1388,26960,659352,19471984,674425600, 26814697056,1203912012000,60251644584384, 3326134996826688,200792710948417536, 13159474030202943744,930524202271542658560, 70616227020854238216192,5724780985202503068533760] |