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 | 2 |
| 1 | 3 |
| 2 | 11 |
| 3 | 47 |
| 4 | 575 |
| 5 | 27647 |
| 6 | 15925247 |
| 7 | 440301256703 |
| 8 | 7011906707722862591 |
| 9 | 3087351335301583621409910816767 |
| 10 | 21648219537098310851336266290644502090473753542655 |