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 | 41 |
| 4 | 1151 |
| 5 | 311 |
| 6 | 34421 |
| 7 | 218918 |
| 8 | 3634531 |
| 9 | 48205429 |
| 10 | 1798467197 |
| 11 | 12941709050 |
| 12 | 166400805323 |
| 13 | 6123584726269 |