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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 26 |
| 6 | 128 |
| 7 | 733 |
| 8 | 3869 |
| 9 | 23620 |
| 10 | 152141 |
| 11 | 1028789 |
| 12 | 7188960 |
| 13 | 51672312 |
| 14 | 381226246 |
| 15 | 2873279651 |