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 | 1048575 |
| 2 | 3485735825 |
| 3 | 1096024843375 |
| 4 | 94267920012849 |
| 5 | 3560791008422351 |
| 6 | 76136107857549025 |
| 7 | 1073129238309234975 |
| 8 | 11004743954450081825 |
| 9 | 87842334540943071199 |
| 10 | 572749994932560009201 |
| 11 | 3161009997514915112975 |
| 12 | 15171203782433324316625 |
| 13 | 64663291650404002121775 |