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 | 13 |
| 3 | 2041 |
| 4 | 24355253 |
| 5 | 249302027 |
| 6 | 16772956369 |
| 7 | 39665616523 |
| 8 | 388885239223 |
| 9 | 2974921088191 |
| 10 | 3487599163841 |
| 11 | 61054982558011 |
| 12 | 200151688351277 |
| 13 | 473329801968959 |