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 | 15 |
| 2 | 39 |
| 3 | 111 |
| 4 | 183 |
| 5 | 255 |
| 6 | 327 |
| 7 | 363 |
| 8 | 471 |
| 9 | 2199 |
| 10 | 3063 |
| 11 | 4359 |
| 12 | 4375 |
| 13 | 5571 |
| 14 | 8751 |
| 15 | 15723 |
| 16 | 36759 |
| 17 | 46791 |
| 18 | 65535 |
| 19 | 140103 |
| 20 | 208191 |
| 21 | 441027 |
| 22 | 4190263 |
| 23 | 9056583 |
| 24 | 57395631 |
| 25 | 172186887 |
| 26 | 236923383 |
| 27 | 918330183 |
| 28 | 3932935775 |
| 29 | 4294967295 |
| 30 | 4764161215 |