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) |
|---|---|
| 2 | 3 |
| 3 | 11 |
| 4 | 59 |
| 5 | 71 |
| 6 | 239 |
| 7 | 191 |
| 8 | 2111 |
| 9 | 1151 |
| 10 | 14591 |
| 11 | 26111 |
| 12 | 15359 |
| 13 | 139967 |
| 14 | 138239 |
| 15 | 675839 |
| 16 | 2101247 |
| 17 | 737279 |
| 18 | 4866047 |
| 19 | 786431 |
| 20 | 22118399 |
| 21 | 36175871 |
| 22 | 194641919 |
| 23 | 63700991 |
| 24 | 138412031 |
| 25 | 169869311 |
| 26 | 1321205759 |
| 27 | 11123294207 |
| 28 | 16357785599 |
| 29 | 4076863487 |
| 30 | 25165823999 |
| 31 | 10871635967 |