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 | 3 |
| 2 | 12 |
| 3 | 34 |
| 4 | 94 |
| 5 | 263 |
| 6 | 768 |
| 7 | 2333 |
| 8 | 7167 |
| 9 | 22291 |
| 10 | 69751 |
| 11 | 219081 |
| 12 | 689736 |
| 13 | 2174856 |
| 14 | 6864354 |
| 15 | 21679391 |
| 16 | 68497906 |
| 17 | 216485583 |
| 18 | 684323923 |
| 19 | 2163459803 |
| 20 | 6840258025 |
| 21 | 21628220224 |
| 22 | 68388917596 |
| 23 | 216252901472 |
| 24 | 683826283482 |
| 25 | 2162393925204 |
| 26 | 6837972506895 |
| 27 | 21623315009817 |