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 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 44 |
| 8 | 99 |
| 9 | 233 |
| 10 | 554 |
| 11 | 1346 |
| 12 | 3300 |
| 13 | 8219 |
| 14 | 20635 |
| 15 | 52300 |
| 16 | 133488 |
| 17 | 343033 |
| 18 | 886360 |
| 19 | 2302133 |
| 20 | 6005835 |