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 | 5 |
| 4 | 16 |
| 5 | 58 |
| 6 | 231 |
| 7 | 1016 |
| 8 | 4782 |
| 9 | 23653 |
| 10 | 121727 |
| 11 | 648611 |
| 12 | 3541871 |
| 13 | 19713695 |