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 | 4 |
| 2 | 9 |
| 3 | 20 |
| 4 | 43 |
| 5 | 91 |
| 6 | 188 |
| 7 | 384 |
| 8 | 777 |
| 9 | 1564 |
| 10 | 3140 |
| 11 | 6293 |
| 12 | 12601 |
| 13 | 25218 |
| 14 | 50453 |
| 15 | 100925 |
| 16 | 201870 |
| 17 | 403762 |
| 18 | 807547 |