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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 18 |
| 4 | 24 |
| 5 | 27 |
| 6 | 160 |
| 7 | 1470 |
| 8 | 1500 |
| 9 | 1701 |
| 10 | 1920 |
| 11 | 2205 |
| 12 | 25515 |
| 13 | 27951 |
| 14 | 392392 |
| 15 | 424710 |
| 16 | 429000 |
| 17 | 481250 |
| 18 | 500500 |
| 19 | 8824530 |
| 20 | 8825856 |
| 21 | 185435250 |
| 22 | 194922000 |
| 23 | 204289085 |
| 24 | 214451328 |
[0,1,4,18,24,27,160,1470,1500,1701,1920,2205, 25515,27951,392392,424710,429000,481250,500500, 8824530,8825856,185435250,194922000,204289085, 214451328] |