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 | 7 |
| 2 | 11 |
| 3 | 13 |
| 4 | 41 |
| 5 | 97 |
| 6 | 137 |
| 7 | 193 |
| 8 | 641 |
| 9 | 769 |
| 10 | 12289 |
| 11 | 40961 |
| 12 | 163841 |
| 13 | 557057 |
| 14 | 786433 |
| 15 | 167772161 |
| 16 | 2281701377 |
| 17 | 3221225473 |
| 18 | 206158430209 |
| 19 | 2748779069441 |
| 20 | 6597069766657 |
| 21 | 38280596832649217 |
| 22 | 180143985094819841 |
| 23 | 221360928884514619393 |
| 24 | 188894659314785808547841 |
| 25 | 193428131138340667952988161 |