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 | 19 |
| 5 | 61 |
| 6 | 197 |
| 7 | 640 |
| 8 | 2091 |
| 9 | 6860 |
| 10 | 22566 |
| 11 | 74365 |
| 12 | 245397 |
| 13 | 810639 |
| 14 | 2680025 |
| 15 | 8865866 |