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 | 18 |
| 4 | 51 |
| 5 | 140 |
| 6 | 377 |
| 7 | 1005 |
| 8 | 2668 |
| 9 | 7069 |
| 10 | 18714 |
| 11 | 49527 |
| 12 | 131052 |
| 13 | 346746 |
| 14 | 917422 |
| 15 | 2427289 |