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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 5 |
| 5 | 9 |
| 6 | 19 |
| 7 | 45 |
| 8 | 107 |
| 9 | 275 |
| 10 | 778 |
| 11 | 2581 |
| 12 | 10170 |
| 13 | 45237 |
| 14 | 222859 |
| 15 | 1191214 |
| 16 | 6887258 |
| 17 | 42894933 |
| 18 | 287397837 |