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 | 1 |
| 1 | 6 |
| 2 | 17 |
| 3 | 40 |
| 4 | 87 |
| 5 | 182 |
| 6 | 373 |
| 7 | 756 |
| 8 | 1523 |
| 9 | 3058 |
| 10 | 6129 |
| 11 | 12272 |
| 12 | 24559 |
| 13 | 49134 |
| 14 | 98285 |
| 15 | 196588 |
| 16 | 393195 |
| 17 | 786410 |
| 18 | 1572841 |
| 19 | 3145704 |
| 20 | 6291431 |
| 21 | 12582886 |
| 22 | 25165797 |
| 23 | 50331620 |
| 24 | 100663267 |
| 25 | 201326562 |
| 26 | 402653153 |
| 27 | 805306336 |
| 28 | 1610612703 |
| 29 | 3221225438 |