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 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 27 |
| 5 | 170 |
| 6 | 1178 |
| 7 | 8459 |
| 8 | 63225 |
| 9 | 494428 |
| 10 | 3959839 |
| 11 | 32485583 |
| 12 | 271251228 |
| 13 | 2298898781 |
| 14 | 19730164908 |
| 15 | 171181827045 |