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 | 4 |
| 4 | 31 |
| 5 | 474 |
| 6 | 14357 |
| 7 | 865024 |
| 8 | 103931595 |
| 9 | 24935913222 |
| 10 | 11956100981537 |
| 11 | 11460773522931212 |
| 12 | 21967828926423843319 |
| 13 | 84207961512578582993810 |
| 14 | 645554571594493917538073933 |
| 15 | 9897742810470352880099047702936 |
| 16 | 303505765229448690912596327628571427 |