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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 405 |
| 3 | 5940 |
| 4 | 81081 |
| 5 | 1061424 |
| 6 | 13533885 |
| 7 | 169579980 |
| 8 | 2099526561 |
| 9 | 25775439624 |
| 10 | 314535422565 |
| 11 | 3821496571620 |
| 12 | 46281602898441 |
| 13 | 559192032726624 |
| 14 | 6744619579010445 |
| 15 | 81244271639092860 |
| 16 | 977710789930868721 |
[1,24,405,5940,81081,1061424,13533885,169579980, 2099526561,25775439624,314535422565,3821496571620, 46281602898441,559192032726624,6744619579010445, 81244271639092860,977710789930868721] |