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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 547 |
| 5 | 538811 |
| 6 | 620245817465 |
| 7 | 692770666469127829226736 |
| 8 | 1025344764595988314871439243086711931108916434521 |