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 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 4 |
| 7 | 11 |
| 8 | 40 |
| 9 | 41 |
| 10 | 132 |
| 11 | 122 |
| 12 | 524 |
| 13 | 407 |
| 14 | 1284 |
| 15 | 3681 |
| 16 | 5683 |
| 17 | 6800 |
| 18 | 18853 |