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 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 19 |
| 8 | 119 |
| 9 | 65339 |
| 10 | 67258454 |
| 11 | 959259994615659593 |
| 12 | 171965197021698738644442682357 |
| 13 | 12959040525296547835480490169418622922155526267774117749963303914461 |