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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 23 |
| 6 | 65 |
| 7 | 166 |
| 8 | 453 |
| 9 | 1157 |
| 10 | 2849 |
| 11 | 6252 |
| 12 | 11894 |
| 13 | 18183 |
| 14 | 21614 |
| 15 | 19139 |
| 16 | 12966 |
| 17 | 6691 |
| 18 | 2813 |
| 19 | 901 |
| 20 | 253 |
| 21 | 49 |
| 22 | 11 |
| 23 | 1 |
| 24 | 1 |