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 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 29 |
| 7 | 61 |
| 8 | 162 |
| 9 | 412 |
| 10 | 1221 |
| 11 | 3665 |
| 12 | 12031 |
| 13 | 40514 |
| 14 | 143244 |
| 15 | 518247 |
| 16 | 1926638 |
| 17 | 7285835 |
| 18 | 28013935 |
| 19 | 109058879 |
| 20 | 429366751 |