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 | 3 |
| 2 | 111 |
| 3 | 2131 |
| 4 | 40085 |
| 5 | 758338 |
| 6 | 14345706 |
| 7 | 271301458 |
| 8 | 5131197358 |
| 9 | 97045266159 |
| 10 | 1835413254015 |
| 11 | 34712996298775 |
| 12 | 656524254453280 |
| 13 | 12416789603607923 |
| 14 | 234837748693978527 |
| 15 | 4441467446525879000 |
| 16 | 84001117092821240904 |