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 | 4 |
| 2 | 24 |
| 3 | 260 |
| 4 | 3528 |
| 5 | 51332 |
| 6 | 762744 |
| 7 | 11406980 |
| 8 | 170939688 |
| 9 | 2563287812 |
| 10 | 38445332184 |
| 11 | 576660215300 |
| 12 | 8649804864648 |
| 13 | 129746582562692 |
| 14 | 1946196290656824 |
| 15 | 29192932133689220 |
| 16 | 437893920912786408 |