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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 15 |
| 5 | 51 |
| 6 | 188 |
| 7 | 733 |
| 8 | 2979 |
| 9 | 12495 |
| 10 | 53708 |
| 11 | 235396 |
| 12 | 1048168 |
| 13 | 4728757 |
| 14 | 21569339 |
| 15 | 99309057 |
| 16 | 460932778 |
| 17 | 2154402107 |