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 | 0 |
| 2 | 28 |
| 3 | 54047322253 |
| 4 | 14756071005948636 |
| 5 | 600605016143706003 |
| 6 | 41181981873797476176 |
| 7 | 240580227206205322973571 |