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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 22 |
| 6 | 52 |
| 7 | 114 |
| 8 | 260 |
| 9 | 564 |
| 10 | 1256 |
| 11 | 2698 |
| 12 | 5908 |
| 13 | 12588 |
| 14 | 27224 |
| 15 | 57620 |
| 16 | 123432 |
| 17 | 259816 |
| 18 | 552400 |
| 19 | 1157466 |
| 20 | 2446004 |
| 21 | 5105532 |
| 22 | 10735352 |
| 23 | 22334524 |
| 24 | 46766200 |
| 25 | 97021272 |
| 26 | 202431152 |
| 27 | 418935364 |
| 28 | 871425160 |
| 29 | 1799558584 |