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 | 2773 |
| 3 | 430081 |
| 4 | 77620661 |
| 5 | 15276834025 |
| 6 | 3180268712125 |
| 7 | 688612022804773 |
| 8 | 153504724110658741 |
| 9 | 34994264014955310181 |
| 10 | 8120680975872203708773 |
| 11 | 1911897036160037674700065 |
| 12 | 455553725980571500127902109 |