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 | 5 |
| 2 | 6 |
| 3 | 8 |
| 4 | 11 |
| 5 | 12 |
| 6 | 23 |
| 7 | 47 |
| 8 | 96 |
| 9 | 191 |
| 10 | 192 |
| 11 | 383 |
| 12 | 768 |
| 13 | 6143 |
| 14 | 12288 |
| 15 | 786431 |
| 16 | 786432 |
| 17 | 3221225472 |
| 18 | 51539607551 |
| 19 | 206158430208 |
| 20 | 824633720831 |
| 21 | 6597069766656 |
| 22 | 26388279066623 |
| 23 | 108086391056891903 |
| 24 | 55340232221128654847 |
| 25 | 221360928884514619392 |
| 26 | 226673591177742970257407 |