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 | 127 |
| 6 | 307 |
| 7 | 1723 |
| 8 | 2801 |
| 9 | 3541 |
| 10 | 8191 |
| 11 | 19531 |
| 12 | 86143 |
| 13 | 131071 |
| 14 | 492103 |
| 15 | 524287 |
| 16 | 552793 |
| 17 | 684757 |
| 18 | 704761 |
| 19 | 735307 |
| 20 | 797161 |
| 21 | 1353733 |
| 22 | 1886503 |
| 23 | 3413257 |
| 24 | 3894703 |
| 25 | 5473261 |
| 26 | 7094233 |
| 27 | 7781311 |
| 28 | 9250723 |
| 29 | 10378063 |
| 30 | 12655807 |
| 31 | 18143341 |
| 32 | 19443691 |
| 33 | 22292563 |
| 34 | 23907211 |