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 | 241 |
| 4 | 742 |
| 5 | 2760 |
| 6 | 8465 |
| 7 | 24317 |
| 8 | 73405 |
| 9 | 214117 |
| 10 | 601411 |
| 11 | 1698702 |
| 12 | 4766632 |
| 13 | 13156641 |
| 14 | 36175599 |
| 15 | 99198867 |
| 16 | 270109351 |
| 17 | 732494449 |
| 18 | 1982055330 |
| 19 | 5345239912 |
| 20 | 14374634237 |
| 21 | 38587852393 |
| 22 | 103391960861 |
| 23 | 276535572481 |
| 24 | 738655032563 |