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 | 3 |
| 4 | 37 |
| 5 | 1204 |
| 6 | 21029921 |
| 7 | 425355555167420 |
| 8 | 439183524292095499600664584581 |
| 9 | 240317442633783387248198509182959563857071128274317237128901 |