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 | 1 |
| 3 | 4 |
| 4 | 11 |
| 5 | 65 |
| 6 | 339 |
| 7 | 2211 |
| 8 | 14356 |
| 9 | 97599 |
| 10 | 671518 |
| 11 | 4696575 |
| 12 | 33186688 |
| 13 | 236773833 |
| 14 | 1702530274 |
| 15 | 12327097246 |
| 16 | 89791558276 |