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 | 3 |
| 4 | 8 |
| 5 | 21 |
| 6 | 50 |
| 7 | 129 |
| 8 | 327 |
| 9 | 827 |
| 10 | 2089 |
| 11 | 5290 |
| 12 | 13386 |
| 13 | 33868 |
| 14 | 85693 |
| 15 | 216836 |
| 16 | 548660 |
| 17 | 1388269 |
| 18 | 3512737 |
| 19 | 8888292 |
| 20 | 22490049 |
| 21 | 56906580 |
| 22 | 143990771 |
| 23 | 364339983 |
| 24 | 921889753 |
| 25 | 2332658401 |
| 26 | 5902327520 |
| 27 | 14934664284 |
| 28 | 37789193522 |
| 29 | 95618028007 |
| 30 | 241942376384 |