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 | 5 |
| 3 | 23 |
| 4 | 53 |
| 5 | 1523 |
| 6 | 29243 |
| 7 | 299513 |
| 8 | 4383593 |
| 9 | 188677703 |
| 10 | 5765999453 |
| 11 | 5765999453 |
| 12 | 2211931390883 |
| 13 | 165468170356703 |
| 14 | 8075975022064163 |
| 15 | 361310530977154973 |
| 16 | 20037783573808880093 |
| 17 | 1779852341342071295513 |
| 18 | 40235059344426324076913 |