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 | 5 |
| 3 | 20 |
| 4 | 101 |
| 5 | 751 |
| 6 | 5949 |
| 7 | 49010 |
| 8 | 418366 |
| 9 | 3627049 |
| 10 | 32067600 |
| 11 | 287357618 |