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 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 5 |
| 9 | 35 |
| 10 | 179 |
| 11 | 909 |
| 12 | 4287 |
| 13 | 19723 |
| 14 | 88240 |
| 15 | 388260 |
| 16 | 1683998 |
| 17 | 7227374 |
| 18 | 30750236 |