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 | 5 |
| 4 | 13 |
| 5 | 34 |
| 6 | 91 |
| 7 | 247 |
| 8 | 680 |
| 9 | 1893 |
| 10 | 5319 |
| 11 | 15056 |
| 12 | 42867 |
| 13 | 122605 |
| 14 | 351898 |
| 15 | 1012729 |
| 16 | 2920521 |
| 17 | 8435362 |
| 18 | 24392655 |
| 19 | 70599403 |
| 20 | 204472264 |