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 | 9 |
| 5 | 19 |
| 6 | 44 |
| 7 | 111 |
| 8 | 328 |
| 9 | 1090 |
| 10 | 3988 |
| 11 | 15838 |
| 12 | 67295 |
| 13 | 301417 |
| 14 | 1412821 |
| 15 | 6882398 |
| 16 | 34682721 |
| 17 | 180170661 |
| 18 | 962288228 |
| 19 | 5273162329 |