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 | 0 |
| 2 | 3 |
| 3 | 7 |
| 4 | 12 |
| 5 | 31 |
| 6 | 24 |
| 7 | 127 |
| 8 | 48 |
| 9 | 56 |
| 10 | 96 |
| 11 | 2047 |
| 12 | 99 |
| 13 | 8191 |
| 14 | 384 |
| 15 | 224 |
| 16 | 195 |
| 17 | 131071 |
| 18 | 199 |
| 19 | 524287 |
| 20 | 387 |
| 21 | 896 |
| 22 | 6144 |
| 23 | 8388607 |
| 24 | 391 |
| 25 | 992 |
| 26 | 24576 |
| 27 | 455 |
| 28 | 1539 |
| 29 | 536870911 |
| 30 | 775 |