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 | 20 |
| 3 | 2300 |
| 4 | 464000 |
| 5 | 116250000 |
| 6 | 32580600000 |
| 7 | 9779307000000 |
| 8 | 3074524280000000 |
| 9 | 999451946900000000 |
| 10 | 333207298730000000000 |
| 11 | 113305219025110000000000 |
| 12 | 39145823948711200000000000 |