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 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 16 |
| 6 | 98 |
| 7 | 269 |
| 8 | 1397 |
| 9 | 7582 |
| 10 | 70520 |
| 11 | 259906 |
| 12 | 1677259 |
| 13 | 5229112 |
| 14 | 44726100 |
| 15 | 666355170 |
| 16 | 4917007185 |
| 17 | 18459879921 |