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 | 28 |
| 4 | 269 |
| 5 | 6181 |
| 6 | 286790 |
| 7 | 26808447 |
| 8 | 5037694829 |
| 9 | 1902773895751 |
| 10 | 1444565587750055 |
| 11 | 2204357811343981558 |
| 12 | 6761166975496300074014 |
| 13 | 41682712965722542326438411 |
| 14 | 516517498759950258411494666787 |
| 15 | 12864972023450485679400300069493738 |