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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 13 |
| 6 | 63 |
| 7 | 399 |
| 8 | 3268 |
| 9 | 33496 |
| 10 | 412943 |
| 11 | 5883727 |
| 12 | 94159721 |
| 13 | 1661723296 |
| 14 | 31954666517 |
| 15 | 663988090257 |
| 16 | 14814445040728 |