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 | 6 |
| 3 | 7 |
| 4 | 14 |
| 5 | 23 |
| 6 | 86 |
| 7 | 179 |
| 8 | 538 |
| 9 | 1439 |
| 10 | 9566 |
| 11 | 21383 |
| 12 | 122847 |
| 13 | 777419 |
| 14 | 1965374 |
| 15 | 6803099 |
| 16 | 19860614 |
| 17 | 26489579 |
| 18 | 269998838 |
| 19 | 477028439 |