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 | 324 |
| 5 | 828 |
| 6 | 2124 |
| 7 | 5436 |
| 8 | 13932 |
| 9 | 35676 |
| 10 | 91404 |
| 11 | 234108 |
| 12 | 599724 |
| 13 | 1536156 |
| 14 | 3935052 |
| 15 | 10079676 |
| 16 | 25819884 |
| 17 | 66138588 |
| 18 | 169418124 |
| 19 | 433972476 |
| 20 | 1111644972 |
| 21 | 2847534876 |
| 22 | 7294114764 |
| 23 | 18684254268 |
| 24 | 47860713324 |
| 25 | 122597730396 |
| 26 | 314040583692 |