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| n | a(n) |
|---|---|
| 0 | 24 |
| 1 | 84 |
| 2 | 924 |
| 3 | 5544 |
| 4 | 40194 |
| 5 | 269874 |
| 6 | 1864584 |
| 7 | 12741324 |
| 8 | 87431844 |
| 9 | 599001144 |
| 10 | 4106310474 |
| 11 | 28143249834 |
| 12 | 192901471224 |
| 13 | 1322153872644 |
| 14 | 9062210132844 |
| 15 | 62113226746824 |
| 16 | 425730613530834 |
| 17 | 2918000448971874 |
| 18 | 20000274149827944 |
| 19 | 137083914357154044 |
| 20 | 939587137457703924 |
[24,84,924,5544,40194,269874,1864584,12741324, 87431844,599001144,4106310474,28143249834, 192901471224,1322153872644,9062210132844, 62113226746824,425730613530834,2918000448971874, 20000274149827944,137083914357154044, 939587137457703924] |