This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 126 |
| 4 | 196 |
| 5 | 504 |
| 6 | 1296 |
| 7 | 3312 |
| 8 | 8464 |
| 9 | 21712 |
| 10 | 55696 |
| 11 | 142544 |
| 12 | 364816 |
| 13 | 934992 |
| 14 | 2396304 |
| 15 | 6136272 |
| 16 | 15713296 |
| 17 | 40258384 |
| 18 | 103144336 |
| 19 | 264177872 |
| 20 | 676624144 |
| 21 | 1733335632 |
| 22 | 4440356496 |
| 23 | 11373699024 |
| 24 | 29133027856 |
| 25 | 74627823952 |
| 26 | 191168323984 |