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 | 1 |
| 2 | 5 |
| 3 | 30 |
| 4 | 180 |
| 5 | 1075 |
| 6 | 6366 |
| 7 | 37520 |
| 8 | 220500 |
| 9 | 1293615 |
| 10 | 7581240 |
| 11 | 44398387 |
| 12 | 259881960 |
| 13 | 1520633270 |
| 14 | 8895116230 |