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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 276 |
| 3 | 2048 |
| 4 | 11178 |
| 5 | 48576 |
| 6 | 177400 |
| 7 | 565248 |
| 8 | 1612875 |
| 9 | 4200352 |
| 10 | 10131156 |
| 11 | 22892544 |
| 12 | 48897678 |
| 13 | 99448320 |
| 14 | 193740408 |
| 15 | 363315200 |
| 16 | 658523925 |
| 17 | 1157743824 |
| 18 | 1980143600 |
| 19 | 3303168000 |
| 20 | 5386270686 |
| 21 | 8602175744 |
| 22 | 13477895856 |
| 23 | 20748607488 |
| 24 | 31425764410 |
| 25 | 46883528256 |
| 26 | 68969957700 |
[1,24,276,2048,11178,48576,177400,565248,1612875, 4200352,10131156,22892544,48897678,99448320, 193740408,363315200,658523925,1157743824, 1980143600,3303168000,5386270686,8602175744, 13477895856,20748607488,31425764410,46883528256, 68969957700] |