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 | 3 |
| 4 | 12 |
| 5 | 70 |
| 6 | 126 |
| 7 | 202 |
| 8 | 585 |
| 9 | 1592 |
| 10 | 2436 |
| 11 | 2544 |
| 12 | 4814 |
| 13 | 9603 |
| 14 | 12148 |
| 15 | 122447 |