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 | 3 |
| 2 | 9 |
| 3 | 24 |
| 4 | 63 |
| 5 | 159 |
| 6 | 394 |
| 7 | 957 |
| 8 | 2292 |
| 9 | 5419 |
| 10 | 12678 |
| 11 | 29385 |
| 12 | 67560 |
| 13 | 154215 |
| 14 | 349770 |
| 15 | 788741 |
| 16 | 1769388 |
| 17 | 3950499 |
| 18 | 8782094 |
| 19 | 19445313 |
| 20 | 42898032 |
| 21 | 94315743 |
| 22 | 206709714 |
| 23 | 451711869 |
| 24 | 984397108 |
| 25 | 2139750939 |
| 26 | 4639901334 |
| 27 | 10038505657 |
| 28 | 21672089592 |
| 29 | 46693408599 |