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 | 18 |
| 2 | 6778629 |
| 3 | 25015702424562603 |
| 4 | 1251577752496617773723676099629193 |
| 5 | 655010254318810176195604047856155787712898209939105520303339 |