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 | 0 |
| 2 | 1 |
| 3 | 13 |
| 4 | 2576 |
| 5 | 2081393 |
| 6 | 3309962320 |
| 7 | 8755277273334 |
| 8 | 35815698613833466 |
| 9 | 214713439275724149414 |
| 10 | 1808298469877117320495867 |