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 | 1 |
| 2 | 7 |
| 3 | 11 |
| 4 | 127 |
| 5 | 1693 |
| 6 | 29243 |
| 7 | 561623 |
| 8 | 13019431 |
| 9 | 379503437 |
| 10 | 11809225121 |
| 11 | 438235268123 |
| 12 | 18007758091069 |
| 13 | 775817745542929 |
| 14 | 36524284093223105 |
| 15 | 1938403609207158571 |
| 16 | 2160165866032831207 |
| 17 | 131893095784520401909 |
| 18 | 8844093116997411126541 |
| 19 | 628373208972323386101329 |
| 20 | 45900898298568589325230523 |