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 | 4 |
| 3 | 72 |
| 4 | 652 |
| 5 | 5213 |
| 6 | 65664 |
| 7 | 345328 |
| 8 | 61277761 |
| 9 | 984024783 |
| 10 | 1 |
| 11 | 116076113582 |
| 12 | 6528440016198 |
| 13 | 352295601578203 |
| 14 | 61085552860021111 |
| 15 | 573958083098398734 |
| 16 | 61615590737044764481 |
| 17 | 771467633688162042728 |
| 18 | 42457573569257080464393 |