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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 185 |
| 4 | 7241 |
| 5 | 525513 |
| 6 | 71973193 |
| 7 | 19054326985 |
| 8 | 9916177373001 |
| 9 | 10235479554015689 |
| 10 | 21045100094428458057 |
| 11 | 86370025530284981044937 |
| 12 | 708236082282948046820221257 |
| 13 | 11609413456993946896013575994313 |