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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 48 |
| 3 | 64 |
| 4 | 1280 |
| 5 | 3072 |
| 6 | 86016 |
| 7 | 49152 |
| 8 | 2949120 |
| 9 | 1310720 |
| 10 | 11534336 |
| 11 | 4194304 |
| 12 | 1526726656 |
| 13 | 2348810240 |
| 14 | 12079595520 |
| 15 | 3221225472 |
| 16 | 73014444032 |
| 17 | 51539607552 |
| 18 | 137095356088320 |
| 19 | 5772436045824 |
| 20 | 3809807790243840 |
| 21 | 725677674332160 |
| 22 | 2023101395107840 |
| 23 | 3166593487994880 |
[1,4,48,64,1280,3072,86016,49152,2949120,1310720, 11534336,4194304,1526726656,2348810240, 12079595520,3221225472,73014444032,51539607552, 137095356088320,5772436045824,3809807790243840, 725677674332160,2023101395107840,3166593487994880] |