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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 81 |
| 5 | 1936 |
| 6 | 70225 |
| 7 | 3437316 |
| 8 | 220017889 |
| 9 | 17821182016 |
| 10 | 1782120871521 |
| 11 | 215636596084900 |
| 12 | 31051670188655281 |
| 13 | 5247732257301156624 |
| 14 | 1028555522495168900401 |
| 15 | 231424992560450869558756 |
| 16 | 59244798095490816735545025 |
| 17 | 17121746649596584336387952896 |