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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 18 |
| 6 | 80 |
| 7 | 475 |
| 8 | 3836 |
| 9 | 39555 |
| 10 | 495045 |
| 11 | 7159696 |
| 12 | 116040456 |
| 13 | 2068782009 |
| 14 | 40107422184 |
| 15 | 838931116609 |