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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 80 |
| 2 | 16 |
| 3 | 43280 |
| 4 | 305424 |
| 5 | 10512 |
| 6 | 272 |
| 7 | 87056 |
| 8 | 2320 |
| 9 | 665872 |
| 10 | 64 |
| 11 | 21520 |
| 12 | 4860176 |
| 13 | 1676649379371438023024192690344976 |
| 14 | 141584 |
| 15 | 54056611079304389108412587463696 |
| 16 | 38414608 |
| 17 | 5136 |
| 18 | 1091856 |
| 19 | 11358841104 |
[4,80,16,43280,305424,10512,272,87056,2320,665872, 64,21520,4860176, 1676649379371438023024192690344976,141584, 54056611079304389108412587463696,38414608,5136, 1091856,11358841104] |