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 | 4147200 |
| 3 | 12743163 |
| 4 | 21147075 |
| 5 | 39143552 |
| 6 | 52921472 |
| 7 | 156754936 |
| 8 | 205889445 |
| 9 | 233935967 |