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 | 1 |
| 3 | 16 |
| 4 | 193 |
| 5 | 19449 |
| 6 | 2535368 |
| 7 | 1436535356 |
| 8 | 2099296647197 |
| 9 | 9043086011797968 |
| 10 | 109561680407727718539 |