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 | 2 |
| 2 | 8 |
| 3 | 72 |
| 4 | 1020 |
| 5 | 32768 |
| 6 | 2097152 |
| 7 | 268460064 |
| 8 | 68721573888 |
| 9 | 35184372088832 |
| 10 | 36028797020012544 |