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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 16 |
| 5 | 84 |
| 6 | 936 |
| 7 | 16758 |
| 8 | 602544 |
| 9 | 37693734 |
| 10 | 4588585904 |
| 11 | 1016082688298 |
| 12 | 436137488655846 |
| 13 | 348748058993750616 |
| 14 | 538461898813943437676 |