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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 640 |
| 3 | 7168 |
| 4 | 294912 |
| 5 | 2883584 |
| 6 | 54525952 |
| 7 | 167772160 |
| 8 | 36507222016 |
| 9 | 326417514496 |
| 10 | 5772436045824 |
| 11 | 50577534877696 |
| 12 | 1759218604441600 |
| 13 | 15199648742375424 |
| 14 | 261208778387488768 |
| 15 | 2233785415175766016 |
| 16 | 101457092405402533888 |
[1,24,640,7168,294912,2883584,54525952,167772160, 36507222016,326417514496,5772436045824, 50577534877696,1759218604441600,15199648742375424, 261208778387488768,2233785415175766016, 101457092405402533888] |