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 | 509 |
| 3 | 146749 |
| 4 | 26444543 |
| 5 | 187206119 |
| 6 | 735187721 |
| 7 | 1662266153 |
| 8 | 2146936021 |
| 9 | 2844048943 |
| 10 | 4335869143 |
| 11 | 5539721989 |
| 12 | 5990371801 |
| 13 | 6145377247 |
| 14 | 6788645863 |
| 15 | 10092092897 |
| 16 | 19122368737 |
| 17 | 20186509381 |
| 18 | 25745240897 |
| 19 | 32732349829 |