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 | 7 |
| 3 | 13 |
| 4 | 31 |
| 5 | 113 |
| 6 | 61 |
| 7 | 193 |
| 8 | 211 |
| 9 | 181 |
| 10 | 241 |
| 11 | 13313 |
| 12 | 421 |
| 13 | 12289 |
| 14 | 2113 |
| 15 | 1009 |
| 16 | 1321 |
| 17 | 2424833 |
| 18 | 1801 |
| 19 | 786433 |
| 20 | 2161 |
| 21 | 4801 |
| 22 | 15361 |
| 23 | 155189249 |
| 24 | 2521 |
| 25 | 6481 |
| 26 | 61441 |
| 27 | 6301 |
| 28 | 8641 |
| 29 | 3489660929 |
| 30 | 12241 |
| 31 | 3221225473 |
| 32 | 7561 |
| 33 | 64513 |
| 34 | 1376257 |
| 35 | 58321 |
| 36 | 12601 |
| 37 | 206158430209 |
| 38 | 8650753 |
| 39 | 184321 |