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 | 25 |
| 2 | 600 |
| 3 | 14400 |
| 4 | 345600 |
| 5 | 8294400 |
| 6 | 199065600 |
| 7 | 4777574100 |
| 8 | 114661771200 |
| 9 | 2751882336300 |
| 10 | 66045171931200 |
| 11 | 1585084026988800 |
| 12 | 38042014263091200 |
| 13 | 913008285082828800 |
| 14 | 21912197468435340900 |
| 15 | 525892706277189044400 |