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 | 2 |
| 3 | 7 |
| 4 | 40 |
| 5 | 357 |
| 6 | 4824 |
| 7 | 96428 |
| 8 | 2800472 |
| 9 | 116473461 |
| 10 | 6855780268 |
| 11 | 565505147444 |
| 12 | 64824245807684 |