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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 40 |
| 5 | 246 |
| 6 | 1816 |
| 7 | 15630 |
| 8 | 153592 |
| 9 | 1696760 |
| 10 | 20816358 |
| 11 | 280807868 |
| 12 | 4131117440 |
| 13 | 65823490088 |
| 14 | 1129256780408 |