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 | 4 |
| 3 | 16 |
| 4 | 172 |
| 5 | 4331 |
| 6 | 232388 |
| 7 | 4865293065 |
| 8 | 40149851165417480 |
| 9 | 18146043304242768613568943751063 |
| 10 | 5522398183372890742378015411585945396419106762128927 |