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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 41 |
| 3 | 227 |
| 4 | 1234 |
| 5 | 6743 |
| 6 | 36787 |
| 7 | 200798 |
| 8 | 1095851 |
| 9 | 5980913 |
| 10 | 32641916 |
| 11 | 178150221 |
| 12 | 972290957 |
| 13 | 5306478436 |
| 14 | 28961194501 |
| 15 | 158061670175 |
| 16 | 862654025422 |
| 17 | 4708111537971 |
| 18 | 25695485730239 |
| 19 | 140238391149386 |
| 20 | 765379824048327 |
| 21 | 4177217595760125 |
| 22 | 22798023012345528 |
| 23 | 124424893212114297 |
[1,8,41,227,1234,6743,36787,200798,1095851, 5980913,32641916,178150221,972290957,5306478436, 28961194501,158061670175,862654025422, 4708111537971,25695485730239,140238391149386, 765379824048327,4177217595760125, 22798023012345528,124424893212114297] |