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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 2 |
| 9 | 9 |
| 10 | 13 |
| 11 | 37 |
| 12 | 81 |
| 13 | 205 |
| 14 | 512 |
| 15 | 1335 |
| 16 | 3404 |
| 17 | 8922 |
| 18 | 23592 |
| 19 | 62630 |
| 20 | 167622 |