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 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 10 |
| 7 | 24 |
| 8 | 67 |
| 9 | 182 |
| 10 | 527 |
| 11 | 1494 |
| 12 | 4351 |
| 13 | 12548 |
| 14 | 36561 |
| 15 | 105962 |
| 16 | 308432 |
| 17 | 894941 |
| 18 | 2602128 |
| 19 | 7549318 |