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 | 7 |
| 2 | 1015 |
| 3 | 367927 |
| 4 | 248956855 |
| 5 | 270732878647 |
| 6 | 431806658432695 |
| 7 | 949587798053709367 |
| 8 | 2753726282896986372535 |
| 9 | 10181613308681289633868087 |
| 10 | 46749244630988859672950920375 |
| 11 | 260970234691672017384493753162807 |
| 12 | 1740621952318191255997909826897420215 |
| 13 | 13670746044282245244660044262911331401527 |