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 | 0 |
| 2 | 2 |
| 3 | 19 |
| 4 | 158 |
| 5 | 1825 |
| 6 | 24264 |
| 7 | 418343 |
| 8 | 8040802 |
| 9 | 186597501 |
| 10 | 5447823140 |
| 11 | 169904387719 |
| 12 | 6317118448398 |
| 13 | 260105476071197 |