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 | 9 |
| 2 | 2047 |
| 3 | 1373653 |
| 4 | 134670080641 |
| 5 | 25326001 |
| 6 | 307768373641 |
| 7 | 3215031751 |
| 8 | 1502401849747176241 |
| 9 | 2152302898747 |
| 10 | 1478868544880821 |
| 11 | 3034679039109989281 |
| 12 | 3474749660383 |