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 | 145 |
| 2 | 46249 |
| 3 | 63121 |
| 4 | 42916624 |
| 5 | 18700677890064 |
| 6 | 28112213204100 |
| 7 | 41654823930457982576640000 |
| 8 | 445860623276908458083942400 |
| 9 | 666474080134036599385635225600 |