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 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 47 |
| 6 | 89 |
| 7 | 173 |
| 8 | 353 |
| 9 | 691 |
| 10 | 1367 |
| 11 | 2707 |
| 12 | 5393 |
| 13 | 10753 |
| 14 | 21481 |
| 15 | 42899 |
| 16 | 85733 |
| 17 | 171131 |
| 18 | 341743 |
| 19 | 682819 |
| 20 | 1364761 |
| 21 | 2728163 |
| 22 | 5454181 |
| 23 | 10906297 |
| 24 | 21808483 |
| 25 | 43611731 |
| 26 | 87215483 |