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 | 2 |
| 2 | 5 |
| 3 | 16 |
| 4 | 57 |
| 5 | 262 |
| 6 | 1746 |
| 7 | 18304 |
| 8 | 340435 |
| 9 | 11805530 |
| 10 | 779700089 |
| 11 | 96708911116 |
| 12 | 22633062447491 |
| 13 | 9857264291668086 |