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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 128 |
| 3 | 1808 |
| 4 | 25872 |
| 5 | 369936 |
| 6 | 5289488 |
| 7 | 75632400 |
| 8 | 1081436176 |
| 9 | 15463010576 |
| 10 | 221099215376 |
| 11 | 3161406558992 |
| 12 | 45203649489936 |
| 13 | 646348354426128 |
| 14 | 9241868742610448 |
| 15 | 132145672330843920 |
| 16 | 1889496507915005968 |
[8,128,1808,25872,369936,5289488,75632400, 1081436176,15463010576,221099215376,3161406558992, 45203649489936,646348354426128,9241868742610448, 132145672330843920,1889496507915005968] |