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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 3 |
| 4 | 45 |
| 5 | 45 |
| 6 | 945 |
| 7 | 945 |
| 8 | 14175 |
| 9 | 14175 |
| 10 | 467775 |
| 11 | 467775 |
| 12 | 638512875 |
| 13 | 638512875 |
| 14 | 1915538625 |
| 15 | 1915538625 |
| 16 | 488462349375 |
| 17 | 488462349375 |
| 18 | 194896477400625 |
| 19 | 194896477400625 |
| 20 | 32157918771103125 |
| 21 | 32157918771103125 |
| 22 | 2218896395206115625 |
| 23 | 2218896395206115625 |
| 24 | 3028793579456347828125 |
| 25 | 3028793579456347828125 |
| 26 | 9086380738369043484375 |
[1,1,3,3,45,45,945,945,14175,14175,467775,467775, 638512875,638512875,1915538625,1915538625, 488462349375,488462349375,194896477400625, 194896477400625,32157918771103125, 32157918771103125,2218896395206115625, 2218896395206115625,3028793579456347828125, 3028793579456347828125,9086380738369043484375] |