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 | 2 |
| 3 | 4 |
| 4 | 16 |
| 5 | 304 |
| 6 | 34864 |
| 7 | 24918064 |
| 8 | 125436246064 |
| 9 | 5056710181206064 |
| 10 | 1834938528961266006064 |
| 11 | 6658608419043265483506006064 |
| 12 | 265790273955000365854215115506006064 |