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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 144 |
| 3 | 67824 |
| 4 | 608928 |
| 5 | 2188608 |
| 6 | 5299056 |
| 7 | 10416624 |
| 8 | 18026640 |
| 9 | 28617228 |
| 10 | 42676728 |
| 11 | 60693480 |
| 12 | 83155824 |
| 13 | 110552100 |
| 14 | 143370648 |
| 15 | 182099808 |
| 16 | 227227920 |
| 17 | 279243324 |
| 18 | 338634360 |
| 19 | 405889368 |
| 20 | 481496688 |
| 21 | 565944660 |
| 22 | 659721624 |
| 23 | 763315920 |
| 24 | 877215888 |
[0,144,67824,608928,2188608,5299056,10416624, 18026640,28617228,42676728,60693480,83155824, 110552100,143370648,182099808,227227920,279243324, 338634360,405889368,481496688,565944660,659721624, 763315920,877215888] |