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 | 67 |
| 2 | 139 |
| 3 | 283 |
| 4 | 571 |
| 5 | 1147 |
| 6 | 2299 |
| 7 | 4603 |
| 8 | 9211 |
| 9 | 18427 |
| 10 | 36859 |
| 11 | 73723 |
| 12 | 147451 |
| 13 | 294907 |
| 14 | 589819 |
| 15 | 1179643 |
| 16 | 2359291 |
| 17 | 4718587 |
| 18 | 9437179 |
| 19 | 18874363 |
| 20 | 37748731 |
| 21 | 75497467 |
| 22 | 150994939 |
| 23 | 301989883 |
| 24 | 603979771 |
| 25 | 1207959547 |
| 26 | 2415919099 |
| 27 | 4831838203 |
| 28 | 9663676411 |
| 29 | 19327352827 |
| 30 | 38654705659 |
| 31 | 77309411323 |