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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 69 |
| 4 | 780 |
| 5 | 11145 |
| 6 | 191178 |
| 7 | 3823785 |
| 8 | 87406056 |
| 9 | 2247785073 |
| 10 | 64228084110 |
| 11 | 2018771719569 |
| 12 | 69221032558956 |
| 13 | 2571290056399545 |
| 14 | 102860527370221026 |
| 15 | 4408690840306136505 |
| 16 | 201557641172689004112 |
| 17 | 9790792086366911655009 |
| 18 | 503570143277542340304534 |
[1,1,8,69,780,11145,191178,3823785,87406056, 2247785073,64228084110,2018771719569, 69221032558956,2571290056399545, 102860527370221026,4408690840306136505, 201557641172689004112,9790792086366911655009, 503570143277542340304534] |