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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 1428 |
| 3 | 108976 |
| 4 | 11088924 |
| 5 | 1410452848 |
| 6 | 215282610348 |
| 7 | 38335940184976 |
| 8 | 7801807561068444 |
| 9 | 1786227911508713008 |
| 10 | 454397569178386774668 |
| 11 | 127153351764004535348176 |
| 12 | 38815768300684586111354364 |
| 13 | 12836619471891836987050169968 |
| 14 | 4571701128215207034965181098988 |
| 15 | 1744488930796462320024115801858576 |
[1,28,1428,108976,11088924,1410452848, 215282610348,38335940184976,7801807561068444, 1786227911508713008,454397569178386774668, 127153351764004535348176, 38815768300684586111354364, 12836619471891836987050169968, 4571701128215207034965181098988, 1744488930796462320024115801858576] |