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 | 3 |
| 2 | 48 |
| 3 | 5215 |
| 4 | 43930979 |
| 5 | 8221176288381971 |
| 6 | 237472642129791861355082716048930 |
| 7 | 59916111345562665920456160598356741759066440491193682529746704653 |