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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 12 |
| 6 | 97 |
| 7 | 675 |
| 8 | 4418 |
| 9 | 28396 |
| 10 | 183615 |
| 11 | 1211936 |
| 12 | 8237223 |
| 13 | 57944187 |
| 14 | 422950882 |
| 15 | 3206531728 |
| 16 | 25247250641 |
| 17 | 206313943476 |
| 18 | 1747990803645 |
| 19 | 15336960025775 |
| 20 | 139187730958406 |
| 21 | 1304967471569208 |
| 22 | 12624893940830455 |
| 23 | 125892638744630088 |
| 24 | 1292581981392588771 |
[1,12,97,675,4418,28396,183615,1211936,8237223, 57944187,422950882,3206531728,25247250641, 206313943476,1747990803645,15336960025775, 139187730958406,1304967471569208, 12624893940830455,125892638744630088, 1292581981392588771] |