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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 10 |
| 6 | 27 |
| 7 | 70 |
| 8 | 206 |
| 9 | 613 |
| 10 | 1942 |
| 11 | 6259 |
| 12 | 20840 |
| 13 | 70528 |
| 14 | 243276 |
| 15 | 850281 |