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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 1475 |
| 5 | 42020826 |
| 6 | 288102296421912 |
| 7 | 1549651963209151973674266 |
| 8 | 12376315346794076107386866097703962244275 |
| 9 | 18103334357369719745485305195095336496837630847237574224638034 |