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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 7 |
| 6 | 24 |
| 7 | 69 |
| 8 | 303 |
| 9 | 1487 |
| 10 | 10275 |
| 11 | 92899 |
| 12 | 1157109 |
| 13 | 19534822 |
| 14 | 447074367 |
| 15 | 13764681083 |
| 16 | 567227701549 |
| 17 | 31139379910949 |