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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 448 |
| 4 | 11820 |
| 5 | 401392 |
| 6 | 16668960 |
| 7 | 818355488 |
| 8 | 46367354632 |
| 9 | 2977828665832 |
| 10 | 213763450387456 |
| 11 | 16961461169786752 |
| 12 | 1474091484740240064 |
| 13 | 139256465915227044352 |
| 14 | 14208358055857371300864 |
| 15 | 1557104405499802200814464 |
| 16 | 182416569911688799401148816 |
| 17 | 22749429746475540390909166048 |
| 18 | 3009102958766163591152586574464 |
| 19 | 420767787785916464100556297780608 |
[1,2,24,448,11820,401392,16668960,818355488, 46367354632,2977828665832,213763450387456, 16961461169786752,1474091484740240064, 139256465915227044352,14208358055857371300864, 1557104405499802200814464, 182416569911688799401148816, 22749429746475540390909166048, 3009102958766163591152586574464, 420767787785916464100556297780608] |