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 | 10 |
| 2 | 26 |
| 3 | 57 |
| 4 | 130 |
| 5 | 304 |
| 6 | 720 |
| 7 | 1653 |
| 8 | 3933 |
| 9 | 9489 |
| 10 | 22954 |
| 11 | 55860 |
| 12 | 136705 |
| 13 | 337951 |
| 14 | 843306 |
| 15 | 2110436 |
| 16 | 5311239 |
| 17 | 13432130 |
| 18 | 34143472 |
| 19 | 87069907 |
| 20 | 222858046 |
| 21 | 572210219 |
| 22 | 1473600000 |
| 23 | 3804733479 |