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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 1078 |
| 3 | 45276 |
| 4 | 1980825 |
| 5 | 88740960 |
| 6 | 4037713680 |
| 7 | 185734829280 |
| 8 | 8613452707860 |
| 9 | 401961126366800 |
| 10 | 18851976826602920 |
| 11 | 887756726925482960 |
| 12 | 41946505347229069860 |
| 13 | 1987619022607162079520 |
| 14 | 94411903573840198777200 |
| 15 | 4494006610114793461794720 |
| 16 | 214307940219849213209335710 |
[1,28,1078,45276,1980825,88740960,4037713680, 185734829280,8613452707860,401961126366800, 18851976826602920,887756726925482960, 41946505347229069860,1987619022607162079520, 94411903573840198777200,4494006610114793461794720, 214307940219849213209335710] |