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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 13 |
| 7 | 28 |
| 8 | 62 |
| 9 | 143 |
| 10 | 338 |
| 11 | 804 |
| 12 | 1948 |
| 13 | 4789 |
| 14 | 11886 |
| 15 | 29796 |
| 16 | 75316 |
| 17 | 191702 |
| 18 | 491040 |
| 19 | 1264926 |
| 20 | 3274594 |
| 21 | 8514784 |
| 22 | 22229481 |
| 23 | 58243870 |