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 | 1 |
| 2 | 9 |
| 3 | 145 |
| 4 | 4641 |
| 5 | 297025 |
| 6 | 38019201 |
| 7 | 9732915457 |
| 8 | 4983252713985 |
| 9 | 5102850779120641 |
| 10 | 10450638395639072769 |
| 11 | 42805814868537642061825 |
| 12 | 350665235403060363770470401 |
| 13 | 5745299216843741000015387049985 |