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 | 5 |
| 3 | 11 |
| 4 | 29 |
| 5 | 59 |
| 6 | 137 |
| 7 | 281 |
| 8 | 569 |
| 9 | 1151 |
| 10 | 2309 |
| 11 | 4649 |
| 12 | 9341 |
| 13 | 19139 |
| 14 | 38711 |
| 15 | 77489 |
| 16 | 155381 |
| 17 | 311681 |
| 18 | 624047 |
| 19 | 1248101 |
| 20 | 2497421 |
| 21 | 4998941 |
| 22 | 10002437 |
| 23 | 20005289 |
| 24 | 40010609 |
| 25 | 80021309 |
| 26 | 160043909 |
| 27 | 320090921 |
| 28 | 640196267 |
| 29 | 1280392739 |
| 30 | 2560793201 |
| 31 | 5121618767 |