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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 25 |
| 7 | 86 |
| 8 | 416 |
| 9 | 1988 |
| 10 | 10640 |
| 11 | 57987 |
| 12 | 328956 |
| 13 | 1900321 |
| 14 | 11204350 |
| 15 | 67042778 |
| 16 | 406780346 |