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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 666 |
| 4 | 1047436 |
| 5 | 30517547395 |
| 6 | 21936950639192784 |
| 7 | 459986536544739894613595 |
| 8 | 324518553658426726783148869733112 |