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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 784 |
| 3 | 21952 |
| 4 | 614656 |
| 5 | 17210368 |
| 6 | 481890304 |
| 7 | 13492928512 |
| 8 | 377801998336 |
| 9 | 10578455953408 |
| 10 | 296196766695424 |
| 11 | 8293509467471872 |
| 12 | 232218265089212416 |
| 13 | 6502111422497947648 |
| 14 | 182059119829942534144 |
| 15 | 5097655355238390956032 |
[1,28,784,21952,614656,17210368,481890304, 13492928512,377801998336,10578455953408, 296196766695424,8293509467471872, 232218265089212416,6502111422497947648, 182059119829942534144,5097655355238390956032] |