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 | 6 |
| 5 | 15 |
| 6 | 51 |
| 7 | 190 |
| 8 | 767 |
| 9 | 3256 |
| 10 | 14420 |
| 11 | 65298 |
| 12 | 301920 |
| 13 | 1416398 |
| 14 | 6730574 |
| 15 | 32315128 |