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) |
|---|---|
| 1 | 4 |
| 2 | 274 |
| 3 | 10609 |
| 4 | 23837527729 |
| 5 | 80641778674 |
| 6 | 3122171529233 |
| 7 | 408933139743937 |
| 8 | 98513851446415969 |
| 9 | 7015254043203144209 |
| 10 | 1690006574433492223897 |
| 11 | 120346786571258131649185 |
| 12 | 2533271375725618104752561 |