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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 57 |
| 9 | 1297 |
| 10 | 28006 |
| 11 | 555446 |
| 12 | 10718940 |
| 13 | 207593322 |
| 14 | 4101787080 |
| 15 | 83030091003 |
| 16 | 1731086543933 |
| 17 | 37278557659029 |
| 18 | 830606719626674 |
| 19 | 19158608403920978 |
| 20 | 457571632376980948 |
| 21 | 11312327413794558348 |
| 22 | 289427158238453113152 |
| 23 | 7659193100381954895675 |
| 24 | 209516361790095291013179 |
[1,57,1297,28006,555446,10718940,207593322, 4101787080,83030091003,1731086543933, 37278557659029,830606719626674,19158608403920978, 457571632376980948,11312327413794558348, 289427158238453113152,7659193100381954895675, 209516361790095291013179] |