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 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 12 |
| 7 | 87 |
| 8 | 662 |
| 9 | 5611 |
| 10 | 51141 |
| 11 | 509277 |
| 12 | 5504398 |
| 13 | 64122940 |
| 14 | 800741192 |
| 15 | 10673478573 |
| 16 | 151323048909 |