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) |
|---|---|
| 0 | 4 |
| 1 | 2 |
| 2 | 7 |
| 3 | 11 |
| 4 | 27 |
| 5 | 41 |
| 6 | 84 |
| 7 | 137 |
| 8 | 270 |
| 9 | 435 |
| 10 | 826 |
| 11 | 1338 |
| 12 | 2488 |
| 13 | 4024 |
| 14 | 7353 |
| 15 | 11899 |
| 16 | 21461 |
| 17 | 34723 |
| 18 | 61960 |
| 19 | 100255 |
| 20 | 177344 |
| 21 | 286947 |
| 22 | 503892 |
| 23 | 815316 |
| 24 | 1422892 |
| 25 | 2302286 |
| 26 | 3996619 |
| 27 | 6466667 |
| 28 | 11173935 |
| 29 | 18079805 |
| 30 | 31114236 |