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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 8 |
| 5 | 46 |
| 6 | 233 |
| 7 | 1109 |
| 8 | 5102 |
| 9 | 23020 |
| 10 | 102718 |
| 11 | 455608 |
| 12 | 2015496 |
| 13 | 8912244 |
| 14 | 39452385 |
| 15 | 175026904 |
| 16 | 778762339 |
| 17 | 3476922430 |
| 18 | 15581908258 |
| 19 | 70108401416 |
| 20 | 316728595048 |
| 21 | 1436752952543 |
| 22 | 6543920192177 |
| 23 | 29923907812601 |
| 24 | 137363507432013 |
| 25 | 632899405886519 |
[1,8,46,233,1109,5102,23020,102718,455608,2015496, 8912244,39452385,175026904,778762339,3476922430, 15581908258,70108401416,316728595048, 1436752952543,6543920192177,29923907812601, 137363507432013,632899405886519] |