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 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 84 |
| 6 | 330 |
| 7 | 1308 |
| 8 | 5210 |
| 9 | 20796 |
| 10 | 83100 |
| 11 | 332232 |
| 12 | 1328598 |
| 13 | 5313732 |
| 14 | 21253620 |
| 15 | 85011864 |
| 16 | 340042246 |
| 17 | 1360158564 |