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 | 4 |
| 3 | 30 |
| 4 | 770 |
| 5 | 5148 |
| 6 | 30566 |
| 7 | 89900 |
| 8 | 219960 |
| 9 | 614460 |
| 10 | 1146596 |
| 11 | 2624076 |
| 12 | 4299916 |
| 13 | 8432732 |
| 14 | 11016390 |
| 15 | 22391148 |
| 16 | 28183214 |