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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 71 |
| 4 | 1311 |
| 5 | 34146 |
| 6 | 1207717 |
| 7 | 57298282 |
| 8 | 3653975784 |
| 9 | 316252925221 |
| 10 | 37596625187796 |
| 11 | 6206102367103899 |
| 12 | 1434418185304457039 |
| 13 | 466995106832397752352 |
| 14 | 215051811411620578152401 |
| 15 | 140491107719613466192347681 |
| 16 | 130481943378389095603359529403 |
[1,1,6,71,1311,34146,1207717,57298282,3653975784, 316252925221,37596625187796,6206102367103899, 1434418185304457039,466995106832397752352, 215051811411620578152401, 140491107719613466192347681, 130481943378389095603359529403] |