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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 9 |
| 5 | 32 |
| 6 | 132 |
| 7 | 597 |
| 8 | 3064 |
| 9 | 17114 |
| 10 | 102274 |
| 11 | 643907 |
| 12 | 4219540 |