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 | 0 |
| 1 | 2 |
| 2 | 288 |
| 3 | 5832 |
| 4 | 51200 |
| 5 | 281250 |
| 6 | 1143072 |
| 7 | 3764768 |
| 8 | 10616832 |
| 9 | 26572050 |
| 10 | 60500000 |
| 11 | 127552392 |
| 12 | 252315648 |
| 13 | 473027282 |
| 14 | 847072800 |
| 15 | 1458000000 |
| 16 | 2424307712 |
| 17 | 3910286178 |
| 18 | 6139206432 |
| 19 | 9409176200 |
| 20 | 14112000000 |
| 21 | 20755401282 |
| 22 | 29988984608 |