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 | 3 |
| 3 | 41 |
| 4 | 617 |
| 5 | 823 |
| 6 | 643 |
| 7 | 9721 |
| 8 | 14593 |
| 9 | 3803 |
| 10 | 14405693 |
| 11 | 10939223 |
| 12 | 4156374407 |
| 13 | 2663693 |
| 14 | 5603770631 |
| 15 | 1221751714624799 |
| 16 | 287108811653770498027 |
| 17 | 74103167823547 |
| 18 | 11843077531813991 |
| 19 | 726216405947772436185983423 |
| 20 | 769725127 |
| 21 | 18274551225153265813469 |