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 | 4 |
| 3 | 36 |
| 4 | 752 |
| 5 | 45960 |
| 6 | 9133760 |
| 7 | 6154473664 |
| 8 | 14334221970688 |
| 9 | 117222686206799936 |
| 10 | 3412369204476033220608 |
| 11 | 357745172369222114451432448 |
| 12 | 136400229481294592916607770361856 |
| 13 | 190697841181900458854914389940360337408 |