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 | 22 |
| 2 | 218 |
| 3 | 1586 |
| 4 | 11361 |
| 5 | 82700 |
| 6 | 615481 |
| 7 | 4634768 |
| 8 | 35003328 |
| 9 | 264487714 |
| 10 | 1997888432 |
| 11 | 15087449584 |
| 12 | 113921725004 |
| 13 | 860155842566 |
| 14 | 6494472790364 |
| 15 | 49035576285772 |
| 16 | 370236844834368 |
| 17 | 2795429838028120 |
| 18 | 21106576528056696 |
| 19 | 159362840727871756 |