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 | 31 |
| 4 | 234 |
| 5 | 1822 |
| 6 | 3611 |
| 7 | 17329 |
| 8 | 1511067 |
| 9 | 524827 |
| 10 | 180469424 |
| 11 | 472532614 |
| 12 | 78102676912 |