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) |
|---|---|
| 7 | 4 |
| 8 | 40 |
| 9 | 260 |
| 10 | 1428 |
| 11 | 7184 |
| 12 | 34238 |
| 13 | 157398 |
| 14 | 705518 |
| 15 | 3104394 |
| 16 | 13469766 |
| 17 | 57811669 |
| 18 | 245990766 |