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 | 1 |
| 2 | 14 |
| 3 | 135 |
| 4 | 5478 |
| 5 | 165826 |
| 6 | 13180268 |
| 7 | 834687179 |
| 8 | 109645021894 |
| 9 | 11966116940238 |
| 10 | 2347836365864484 |
| 11 | 393938089395885894 |
| 12 | 107947764316226205276 |
| 13 | 25835579116799316507780 |