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 | 4 |
| 3 | 12 |
| 4 | 84 |
| 5 | 1596 |
| 6 | 84588 |
| 7 | 11081028 |
| 8 | 3446199708 |
| 9 | 2477817590052 |
| 10 | 4011586678294188 |
| 11 | 14726534696017964148 |
| 12 | 120183249654202605411828 |
| 13 | 2146833388573021140471483564 |
| 14 | 83453854313999050793547980583372 |
| 15 | 7011542477899258250521520684673165324 |