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 | 5 |
| 4 | 15 |
| 5 | 33 |
| 6 | 40 |
| 7 | 132 |
| 8 | 220 |
| 9 | 352 |
| 10 | 1258 |
| 11 | 2661 |
| 12 | 3903 |
| 13 | 9787 |
| 14 | 12989 |
| 15 | 17961 |
| 16 | 31373 |
| 17 | 33076 |
| 18 | 55262 |
| 19 | 110624 |