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 | 1 |
| 6 | 2 |
| 7 | 15 |
| 8 | 85 |
| 9 | 650 |
| 10 | 5800 |
| 11 | 65243 |
| 12 | 931258 |
| 13 | 17182237 |
| 14 | 414512599 |
| 15 | 13161989059 |