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 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 37 |
| 6 | 81 |
| 7 | 169 |
| 8 | 355 |
| 9 | 727 |
| 10 | 1491 |
| 11 | 3019 |
| 12 | 6119 |
| 13 | 12319 |
| 14 | 24807 |
| 15 | 49783 |
| 16 | 99921 |
| 17 | 200197 |
| 18 | 401121 |
| 19 | 802969 |
| 20 | 1607429 |
| 21 | 3216349 |
| 22 | 6435717 |
| 23 | 12874453 |
| 24 | 25755025 |
| 25 | 51516169 |
| 26 | 103044657 |
| 27 | 206101633 |
| 28 | 412228073 |
| 29 | 824480953 |
| 30 | 1649011689 |