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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 64 |
| 4 | 5860 |
| 5 | 460 |
| 6 | 74260 |
| 7 | 14260 |
| 8 | 1221760 |
| 9 | 5567104 |
| 10 | 103360 |
| 11 | 20120860 |
| 12 | 169096960 |
| 13 | 1211757760 |
| 14 | 31286787760 |
| 15 | 31498960 |
| 16 | 114183284260 |
| 17 | 1553569960 |
| 18 | 33186496960 |
| 19 | 446613160960 |
| 20 | 43581101074960 |
| 21 | 274644405760 |
| 22 | 64262632960 |
| 23 | 121634429663260 |
| 24 | 5786547945760 |
[1,4,64,5860,460,74260,14260,1221760,5567104, 103360,20120860,169096960,1211757760,31286787760, 31498960,114183284260,1553569960,33186496960, 446613160960,43581101074960,274644405760, 64262632960,121634429663260,5786547945760] |