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 | 9 |
| 3 | 70 |
| 4 | 798 |
| 5 | 12230 |
| 6 | 238979 |
| 7 | 5746740 |
| 8 | 165778237 |
| 9 | 5626476014 |
| 10 | 221330040771 |
| 11 | 9950747684006 |