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 | 3 |
| 5 | 8 |
| 6 | 32 |
| 7 | 126 |
| 8 | 619 |
| 9 | 3332 |
| 10 | 20910 |
| 11 | 157721 |
| 12 | 1590330 |
| 13 | 23074092 |
| 14 | 487448150 |
| 15 | 14466253437 |
| 16 | 585505737038 |