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A004341 as a simple table
| n | a(n) |
|---|---|
| 11 | 1 |
| 12 | 48 |
| 13 | 1326 |
| 14 | 27720 |
| 15 | 487635 |
| 16 | 7624512 |
| 17 | 109453344 |
| 18 | 1473109704 |
| 19 | 18855883575 |
| 20 | 231900297200 |
| 21 | 2761025887620 |
| 22 | 32006008361808 |
| 23 | 362827605867363 |
| 24 | 4036320536972640 |
| 25 | 44186942677323600 |
| 26 | 477092811067148640 |
[1,48,1326,27720,487635,7624512,109453344, 1473109704,18855883575,231900297200,2761025887620, 32006008361808,362827605867363,4036320536972640, 44186942677323600,477092811067148640] |