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 | 2 |
| 2 | 26 |
| 3 | 1378 |
| 4 | 141202 |
| 5 | 22716418 |
| 6 | 5218302090 |
| 7 | 1619288968386 |
| 8 | 653379470919714 |
| 9 | 333014944014777730 |
| 10 | 209463165121436380282 |
| 11 | 159492000935562428176162 |
| 12 | 144654795258284936534929586 |
| 13 | 154140229756873813307283828098 |