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 | 11 |
| 3 | 1 |
| 4 | 311 |
| 5 | 5 |
| 6 | 7291 |
| 7 | 243 |
| 8 | 14462317 |
| 9 | 3364621 |
| 10 | 3337014731 |
| 11 | 3155743303 |
| 12 | 65528247068741 |
| 13 | 2627553901 |
| 14 | 1439156737843967 |
| 15 | 2213381206625 |
| 16 | 21757704362231905789 |
| 17 | 2627003970197650333 |
| 18 | 64925181492079668050329 |
| 19 | 523317843775891637 |
| 20 | 161371847993975070290712761 |
| 21 | 78461950306245817433389909 |