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 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 7 |
| 8 | 10 |
| 9 | 18 |
| 10 | 43 |
| 11 | 86 |
| 12 | 185 |
| 13 | 449 |
| 14 | 1091 |
| 15 | 2764 |
| 16 | 6978 |
| 17 | 17951 |
| 18 | 47146 |
| 19 | 125507 |
| 20 | 337600 |
| 21 | 916229 |
| 22 | 2504458 |
| 23 | 6898908 |