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 | 9 |
| 3 | 179 |
| 4 | 23750 |
| 5 | 17404018 |
| 6 | 30640203562 |
| 7 | 69308975221311 |
| 8 | 158348647910702036 |
| 9 | 337705364634088701870 |
| 10 | 658924882943438469999753 |
| 11 | 1175202923618550525380785445 |
| 12 | 1924770620147760792778941634653 |