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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 6 |
| 5 | 17 |
| 6 | 59 |
| 7 | 195 |
| 8 | 703 |
| 9 | 2499 |
| 10 | 9188 |
| 11 | 33890 |
| 12 | 126758 |
| 13 | 476269 |
| 14 | 1802311 |
| 15 | 6849776 |
| 16 | 26152417 |
| 17 | 100203193 |