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 | 3 |
| 3 | 5 |
| 4 | 16 |
| 5 | 45 |
| 6 | 167 |
| 7 | 609 |
| 8 | 2471 |
| 9 | 10143 |
| 10 | 43223 |
| 11 | 186533 |
| 12 | 818836 |
| 13 | 3629835 |
| 14 | 16250859 |
| 15 | 73300289 |
| 16 | 332895316 |
| 17 | 1520604469 |
| 18 | 6981991345 |
| 19 | 32205476541 |