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| n | a(n) |
|---|---|
| 13 | 13 |
| 14 | 745290 |
| 15 | 2153888100 |
| 16 | 1850107896000 |
| 17 | 813987254808000 |
| 18 | 233983253596659840 |
| 19 | 50146687652338368000 |
| 20 | 8684014103185704192000 |
| 21 | 1281139242561407305440000 |
| 22 | 167044094432657294973120000 |
[13,745290,2153888100,1850107896000, 813987254808000,233983253596659840, 50146687652338368000,8684014103185704192000, 1281139242561407305440000, 167044094432657294973120000] |