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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 3 |
| 6 | 6 |
| 7 | 15 |
| 8 | 24 |
| 9 | 43 |
| 10 | 92 |
| 11 | 171 |
| 12 | 315 |
| 13 | 629 |
| 14 | 1218 |
| 15 | 2313 |
| 16 | 4523 |
| 17 | 8835 |
| 18 | 17076 |
| 19 | 33299 |
| 20 | 65169 |