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 | 6 |
| 4 | 9 |
| 5 | 56 |
| 6 | 23 |
| 7 | 399 |
| 8 | 442 |
| 9 | 2220 |
| 10 | 2386 |
| 11 | 71577 |
| 12 | 22001 |
| 13 | 1179483 |
| 14 | 1156519 |
| 15 | 4975079 |