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 | 3 |
| 2 | 7 |
| 3 | 13 |
| 4 | 721 |
| 5 | 1918 |
| 6 | 170131 |
| 7 | 782425 |
| 8 | 7463847412 |
| 9 | 1593963129003485032 |
| 10 | 111265944731096246910079816 |
| 11 | 721882010875193363312928672952261 |
| 12 | 727501488517303786137132964064381141071 |