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) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 49 |
| 3 | 619 |
| 4 | 737 |
| 5 | 35111 |
| 6 | 305917 |
| 7 | 1930753 |
| 8 | 14779003 |
| 9 | 46162429 |
| 10 | 139399997 |
| 11 | 92993347501 |
| 12 | 606843495583 |
| 13 | 5559358281401 |
| 14 | 240588034396789 |
| 15 | 660664176177209 |
| 16 | 682418523335551 |
| 17 | 471285453584720627 |
| 18 | 732894385728160361 |