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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 25 |
| 4 | 69 |
| 5 | 205 |
| 6 | 597 |
| 7 | 1701 |
| 8 | 4949 |
| 9 | 14389 |
| 10 | 41493 |
| 11 | 120149 |
| 12 | 348437 |
| 13 | 1008021 |
| 14 | 2917653 |
| 15 | 8451605 |
| 16 | 24467733 |
| 17 | 70830869 |
| 18 | 205101333 |
| 19 | 593841429 |
| 20 | 1719269653 |
| 21 | 4977934613 |
| 22 | 14412904725 |
| 23 | 41729378581 |
| 24 | 120820070677 |
| 25 | 349814724885 |
| 26 | 1012822636821 |
| 27 | 2932443592981 |
| 28 | 8490378131733 |