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 | 5 |
| 3 | 11 |
| 4 | 17 |
| 5 | 41 |
| 6 | 83 |
| 7 | 137 |
| 8 | 257 |
| 9 | 641 |
| 10 | 1097 |
| 11 | 17477 |
| 12 | 65537 |
| 13 | 140417 |
| 14 | 557057 |
| 15 | 2384897 |
| 16 | 4227137 |
| 17 | 35946497 |
| 18 | 71304257 |
| 19 | 541073537 |
| 20 | 2281701377 |
| 21 | 2336497860617 |
| 22 | 600470787982337 |
| 23 | 2278291849363457 |
| 24 | 4538923050090497 |
| 25 | 38280596832649217 |