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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 1716 |
| 3 | 118864 |
| 4 | 8684340 |
| 5 | 653817528 |
| 6 | 50181947376 |
| 7 | 3903669874104 |
| 8 | 306689672988468 |
| 9 | 24278779897856848 |
| 10 | 1933612147959994216 |
| 11 | 154751222973374578656 |
| 12 | 12435284300689518633456 |
| 13 | 1002664938117354309314220 |
| 14 | 81080672610600385236492840 |
| 15 | 6573062133232532447808798864 |
[1,28,1716,118864,8684340,653817528,50181947376, 3903669874104,306689672988468,24278779897856848, 1933612147959994216,154751222973374578656, 12435284300689518633456,1002664938117354309314220, 81080672610600385236492840, 6573062133232532447808798864] |