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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 20 |
| 7 | 101 |
| 8 | 743 |
| 9 | 7350 |
| 10 | 91763 |
| 11 | 1344782 |
| 12 | 22160335 |
| 13 | 401278984 |
| 14 | 7885687604 |
| 15 | 166870266608 |
| 16 | 3781101495300 |