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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 94 |
| 4 | 1468 |
| 5 | 28676 |
| 6 | 673096 |
| 7 | 18456208 |
| 8 | 578989664 |
| 9 | 20451955168 |
| 10 | 803281220416 |
| 11 | 34725507491456 |
| 12 | 1638442250105728 |
| 13 | 83783085867535744 |
| 14 | 4615534061313644288 |
| 15 | 272513023397196560896 |
| 16 | 17167327855852316678656 |
| 17 | 1149361306938635404179968 |
| 18 | 81495563955795289474269184 |
[1,1,8,94,1468,28676,673096,18456208,578989664, 20451955168,803281220416,34725507491456, 1638442250105728,83783085867535744, 4615534061313644288,272513023397196560896, 17167327855852316678656,1149361306938635404179968, 81495563955795289474269184] |