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 | 7 |
| 3 | 89 |
| 4 | 1720 |
| 5 | 45887 |
| 6 | 1595192 |
| 7 | 69438623 |
| 8 | 3675895762 |
| 9 | 231400961167 |
| 10 | 17017734251838 |
| 11 | 1441193215057543 |