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 | 1 |
| 5 | 1 |
| 6 | 5 |
| 7 | 13 |
| 8 | 29 |
| 9 | 73 |
| 10 | 193 |
| 11 | 581 |
| 12 | 1717 |
| 13 | 7029 |
| 14 | 21981 |
| 15 | 79625 |
| 16 | 248697 |
| 17 | 981353 |
| 18 | 3275085 |
| 19 | 13235333 |