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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 25 |
| 4 | 280 |
| 5 | 5665 |
| 6 | 211516 |
| 7 | 14907673 |
| 8 | 2021820016 |
| 9 | 535262714881 |
| 10 | 279317901141172 |
| 11 | 289064917007756761 |
| 12 | 595455410823115765768 |
| 13 | 2446703815513439818406305 |
| 14 | 20077597428602000393057306476 |
| 15 | 329252263598282049972950683567705 |
| 16 | 10794203801863458962317873561872563680 |
[1,1,4,25,280,5665,211516,14907673,2021820016, 535262714881,279317901141172,289064917007756761, 595455410823115765768,2446703815513439818406305, 20077597428602000393057306476, 329252263598282049972950683567705, 10794203801863458962317873561872563680] |