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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 81 |
| 5 | 317 |
| 6 | 1537 |
| 7 | 6553 |
| 8 | 32093 |
| 9 | 143493 |
| 10 | 706865 |
| 11 | 3253045 |
| 12 | 16084801 |
| 13 | 75439549 |
| 14 | 373966353 |
| 15 | 1777282613 |
| 16 | 8826387409 |
| 17 | 42353608637 |
| 18 | 210621679933 |
| 19 | 1018027136981 |
| 20 | 5067758038661 |
| 21 | 24632141537281 |
| 22 | 122716063253689 |
| 23 | 599102485940953 |
| 24 | 2986546886121353 |
| 25 | 14631911369167485 |
| 26 | 72976545797444585 |
[1,1,5,17,81,317,1537,6553,32093,143493,706865, 3253045,16084801,75439549,373966353,1777282613, 8826387409,42353608637,210621679933,1018027136981, 5067758038661,24632141537281,122716063253689, 599102485940953,2986546886121353, 14631911369167485,72976545797444585] |