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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 19 |
| 5 | 75 |
| 6 | 866 |
| 7 | 38546 |
| 8 | 6435801 |
| 9 | 4411898775 |
| 10 | 12497557933746 |
| 11 | 172551409850674506 |
| 12 | 10689931902245247171663 |
| 13 | 3609784804719064481553949028 |
| 14 | 6092547417568499138450938430843772 |
| 15 | 57094466457110460366185443558858325798634 |