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 | 2 |
| 2 | 7 |
| 3 | 44 |
| 4 | 558 |
| 5 | 16926 |
| 6 | 1319358 |
| 7 | 269695440 |
| 8 | 146202099255 |
| 9 | 212360894456310 |
| 10 | 834625722216941739 |
| 11 | 8954592469138636320960 |
| 12 | 264305834899495393164591240 |
| 13 | 21607243912704793462806305720502 |
| 14 | 4921054357098031770205099867497197328 |