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 | 5 |
| 3 | 79 |
| 4 | 2621 |
| 5 | 149071 |
| 6 | 12954365 |
| 7 | 1596620719 |
| 8 | 264914218301 |
| 9 | 56934521042191 |
| 10 | 15385666763366525 |
| 11 | 5106110041462786159 |
| 12 | 2041611328770984737981 |
| 13 | 967972254733121945653711 |
| 14 | 536962084044317668770841085 |
| 15 | 344546100916295014902350596399 |