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 | 9 |
| 2 | 73 |
| 3 | 5257 |
| 4 | 27630793 |
| 5 | 763460694178057 |
| 6 | 582872231554839914154126117193 |
| 7 | 339740038317718918529575265905277902175236102890836244082057 |