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 | 0 |
| 1 | 5 |
| 2 | 83 |
| 3 | 442 |
| 4 | 2140 |
| 5 | 8980 |
| 6 | 34960 |
| 7 | 124124 |
| 8 | 418816 |